CASE 017
:
THE CASE OF THE SANTA CATARINA
A fishing net snags on something at 140 feet off the New Jersey coast. Divers find a shipwreck — cargo intact, origin unknown, no record of a vessel lost at this location. Ocean currents, wood chemistry, cargo analysis, and 300-year-old shipping records are about to tell the story of a ship that never arrived.
CASE BRIEFING
On a morning in late September the fishing vessel Marguerite B. was working the offshore grounds forty-three miles east of Atlantic City when her captain felt the nets snag hard.
Captain Ray Okafor had fished these waters for nineteen years. He knew the bottom here — mostly sand and shell, occasionally a modern wreck well-documented in the charts. This was not on any chart he had ever seen.
He marked the coordinates. He freed the nets. He called the Coast Guard.
By the following weekend a recreational dive team had reached the site. What they found at 140 feet — working quickly in the cold dark water with limited bottom time — was enough to stop them mid-descent.
A wooden hull. Partially buried in the sand but largely intact. Two masts collapsed across the deck. A cargo hold visible through a section of collapsed planking. Ceramic vessels stacked in the hold — sealed, undisturbed, covered in marine growth but recognizably intact after what appeared to be centuries on the seabed.
No identifying markings visible through the silt and growth.
No record of a wooden vessel lost at this location in any maritime database — historical or modern.
The dive team filed a report with the National Oceanic and Atmospheric Administration. Under the Abandoned Shipwreck Act the wreck fell under federal jurisdiction. NOAA dispatched a maritime archaeology team within ten days.
Dr. Elena Vasquez — maritime archaeologist and lead investigator — arrived at the site on a Monday morning. She had worked on wrecks from the Caribbean to the Baltic. She had never worked one quite like this.
"Every wreck tells a story," she told her team during the pre-dive briefing. "The question is always whether we have the science to read it."
The initial dive confirmed what the recreational team had reported — and added details.
The vessel was wooden — hull construction consistent with European shipbuilding of the 17th or 18th century. Length approximately 85 feet. Beam approximately 22 feet. A brigantine configuration — two masts, the forward one square-rigged. Hull construction using wooden pegs and iron fastenings, many of the iron components heavily corroded but some still intact beneath marine concretion.
The cargo hold contained what appeared to be several dozen ceramic storage vessels — large, round-bottomed, sealed with cork and wax. Some had broken during the sinking and their contents had long since dispersed into the seawater. Others appeared intact — their seals still holding after centuries on the seabed.
Beneath the ceramic vessels — visible through a gap in the planking where sediment had shifted — something else was stacked. Dark, dense, rectangular. Not ceramic. Not wood.
Dr. Vasquez photographed it from every angle before surfacing.
"We don't know where she came from," she said in her dive log that evening. "We don't know when she sailed. We don't know why she sank. And we don't know everything she was carrying."
"Yet."
Your investigation begins now.
A wooden ship has been resting on the bottom of the Atlantic for an unknown period of time. No record places her here. No manifest names her. No survivor ever reported her loss.
Examine all five Evidence Files. The ocean current analysis, the wood chemistry, the cargo analysis, the artifact identification, and the historical shipping records all have something to say.
The ocean kept her secret for three centuries. The science is about to read it.
Where did the Santa Catarina sail from — what was she carrying — and why did she sink?
Instructions:
Play solo or with a team of up to 5 investigators. Examine the five Evidence Files together, or divide them among your team and have each investigator analyze different clues. Share what you discover, compare theories, and decide which evidence matters most.
When you've examined all the evidence, work individually or as a team to reach your final verdict—then reveal the solution to see if you cracked the case.
EVIDENCE FILES
EVIDENCE FILE 01 +
EVIDENCE FILE 01 — OCEAN CURRENT ANALYSIS
Case Reference: NOAA-2024-0934
Evidence Item: EV-01 — Wreck position analysis and Atlantic current context
Prepared By: Dr. Marcus Webb, NOAA Ocean Current Modelling Unit
Date: October 14
BACKGROUND
Before any physical evidence from the wreck was analyzed Dr. Vasquez's team needed to address the most fundamental orienting question — what does the wreck's position tell us about where this vessel might have come from?
A ship does not sink precisely where it encounters its fatal problem. A vessel disabled by storm damage, flooding, or structural failure may drift for hours or days before sinking — carried by wind and current. The wreck's position marks where it came to rest on the seabed, not necessarily where disaster struck.
However it is important to be clear about what current analysis can and cannot establish. Reconstructing the precise drift path of a vessel that sank 276 years ago — with unknown sea state, unknown flooding rate, unknown wind conditions at the time, and unknown time spent drifting — is not possible. What current analysis can do is establish whether the wreck's position is broadly consistent with particular origin regions and shipping routes — and whether it is inconsistent with others.
THE WRECK POSITION
The wreck lies at coordinates 39.14°N — 72.31°W at a depth of 140 feet — approximately 43 nautical miles east of Atlantic City, New Jersey.
This position places the wreck on the outer continental shelf — beyond the modern coastal shipping lanes but within the historical trans-Atlantic shipping corridor used by European merchant vessels bound for colonial American ports in the 18th century.
ATLANTIC CURRENT SYSTEMS — RELEVANT TO THIS LOCATION
Two major current systems influence the waters in the vicinity of the wreck site.
The Gulf Stream flows northward along the eastern seaboard before turning northeast toward Europe. Its western wall runs approximately 60 to 80 nautical miles east of the wreck position. The Gulf Stream is a powerful northeastward-flowing current — a vessel carried into it would be transported away from the American coast toward Europe, not toward the New Jersey shelf.
The Continental Shelf Currents — slower and more variable — flow generally southwestward along the outer shelf at this latitude during autumn months. A vessel disabled on the outer shelf might drift gradually southwestward under these currents over an extended period.
Prevailing autumn winds at this latitude blow predominantly from the northwest — which would push a surface vessel southeastward. However a waterlogged or partially flooded vessel sitting low in the water would respond more to subsurface currents than surface wind.
WHAT THE POSITION TELLS US
The wreck lies west of the Gulf Stream on the outer continental shelf. This has one significant implication — the vessel almost certainly approached from the east rather than being carried from the Gulf Stream. A vessel caught in the Gulf Stream would be transported northeastward away from this position, not deposited on the western shelf.
This places the vessel's probable approach from the open Atlantic to the east — consistent with a trans-Atlantic crossing arriving from a European port.
A Caribbean origin — a vessel approaching from the south — is possible in principle. The outer New Jersey shelf is reachable from the south. However a Caribbean vessel approaching northward would need to navigate across or around the Gulf Stream, which represents a significant additional navigational challenge and is a less direct route to Philadelphia or other colonial American ports than an eastward Atlantic approach.
The current analysis cannot establish specific distances or drift durations — too many variables are unknown. What it establishes is that the wreck position is consistent with a European vessel on a westward trans-Atlantic crossing approaching the American coast and most probably inconsistent with a vessel that had been carried into the Gulf Stream at any point before sinking.
THE OUTER SHELF AS A HAZARD ZONE
The outer continental shelf at this location was documented in colonial-era navigational charts as a zone of unpredictable currents and shallow-water hazards during autumn storm conditions. Several colonial-era vessels are known to have been lost in this general region during the 18th century.
The shelf edge position is consistent with a vessel that had successfully crossed the Atlantic and was in the final approach to its destination — close enough to the American coast to be nearing landfall but caught in deteriorating conditions before reaching port.
YOUR TASK
The current analysis has established that the wreck position is most consistent with a European vessel on a westward trans-Atlantic crossing — approaching the American coast from the east and coming to rest on the outer continental shelf before reaching its destination.
Research what the major trans-Atlantic shipping routes looked like in the 17th and 18th centuries — and which European ports sent merchant vessels to colonial American ports along these routes. Consider what the autumn position on the New Jersey shelf tells you about the vessel's likely destination and approximate departure timing.
The current analysis points toward a European origin but cannot establish which European port or country. That question requires the physical evidence from the wreck itself.
What would you look for in the wreck's construction materials and cargo to narrow the geographic origin — and rule out the Caribbean alternative? Evidence File 02 begins to answer that question by examining the wood from which the ship was built.
EVIDENCE FILE 02 +
EVIDENCE FILE 02 — WOOD ANALYSIS AND DENDROCHRONOLOGY
Case Reference: NOAA-2024-0934
Evidence Item: EV-02 — Hull timber species identification and tree ring dating
Prepared By: Dr. Sarah Chen, Maritime Archaeology Laboratory
Date: October 18
BACKGROUND
A ship is built from the trees available to its builders. Wood species vary significantly by region — a vessel built in Portugal used different timber than one built in England, the Caribbean, or New England. Identifying the species of wood used in the hull can strongly suggest the geographic region where the vessel was likely constructed — since shipyards historically used locally available timber — though it establishes more precisely where the timber grew than where the ship was assembled.
Beyond species identification the science of dendrochronology — tree ring dating — can establish when the timber was felled and therefore when the vessel was built. Trees grow one ring per year and the pattern of wide and narrow rings reflects the climate conditions of each growing season. By matching a timber's ring pattern against a reference chronology for a specific region investigators can identify both the probable geographic origin of the wood and the approximate year it was cut.
Dr. Chen extracted timber samples from five locations on the hull for species identification and dendrochronological analysis.
TIMBER SAMPLING LOCATIONS
Sample T1 — main keel — the central structural timber running the length of the vessel
Sample T2 — forward frame timber — structural rib on the port side
Sample T3 — stern post — the vertical timber at the rear of the hull
Sample T4 — deck planking — recovered from a section of intact deck
Sample T5 — cargo hold lining — interior planking of the hold
WOOD SPECIES IDENTIFICATION
Laboratory analysis identified the following species across the five samples:
Sample T1 — Main keel:
Species: Quercus faginea — Portuguese oak
Natural distribution: Iberian Peninsula — Portugal and western Spain
Historical use: primary structural timber in Portuguese and Spanish shipbuilding throughout the 16th to 18th centuries
Sample T2 — Forward frame timber:
Species: Quercus faginea — Portuguese oak
Note: consistent with T1 — the same species used throughout the primary structural frame
Sample T3 — Stern post:
Species: Quercus faginea — Portuguese oak
Sample T4 — Deck planking:
Species: Juniperus cedrus — Atlantic cedar
Natural distribution: Macaronesian islands — Madeira and the Canary Islands — historically harvested for Portuguese shipbuilding due to its resistance to marine boring organisms
Sample T5 — Cargo hold lining:
Species: Pinus pinaster — maritime pine
Natural distribution: Iberian Peninsula and Mediterranean coast — widely used for interior planking in Portuguese vessels
SPECIES ANALYSIS — WHAT THE TIMBER SUGGESTS
The combination of Portuguese oak for primary structure, Atlantic cedar for deck planking, and maritime pine for interior lining is characteristic of Iberian shipbuilding practice — most likely Portuguese — from the 17th and 18th centuries.
Shipyards typically sourced timber from their immediate region and established supply networks. Portuguese shipyards on the Tagus and Douro rivers had long-standing timber supply relationships with Portuguese oak forests, Madeiran cedar harvests, and Iberian maritime pine stands. The presence of all three species in the proportions and locations found here is strongly suggestive of Portuguese construction — though it cannot rule out another Iberian shipyard that sourced timber through Portuguese supply networks.
This combination is distinct from:
English shipbuilding — which used English oak and Baltic timber imports
Dutch shipbuilding — which relied heavily on Baltic pine and oak
New England shipbuilding — which used American white oak, white pine, and chestnut
Caribbean-built vessels — which used tropical hardwoods including mahogany, lignum vitae, and Caribbean pine
The Caribbean origin suggested as a possibility in Evidence File 01 is made significantly less probable by the wood species analysis. No tropical hardwoods are present in any sampled timber — and tropical hardwoods were the dominant construction material in Caribbean shipyards of this period. A Caribbean-built vessel would almost certainly show at least some tropical species in its structural timbers.
DENDROCHRONOLOGY — CONSTRUCTION DATE
Dr. Chen submitted the five timber samples for dendrochronological analysis — comparing ring patterns against established reference chronologies.
Portuguese oak samples T1, T2, and T3 were matched against the Portuguese oak master chronology maintained by the Coimbra Dendrochronology Laboratory. Atlantic cedar sample T4 was matched against the Madeiran cedar chronology. Maritime pine sample T5 was matched against the Iberian maritime pine chronology.
Results:
Sample T1 — main keel: outermost ring dated to 1743
Sample T2 — forward frame: outermost ring dated to 1744
Sample T3 — stern post: outermost ring dated to 1742
Sample T4 — deck planking: outermost ring dated to 1745
Sample T5 — cargo hold lining: outermost ring dated to 1744
The outermost ring represents the final year of the tree's growth before it was felled. Timber was typically used in shipbuilding within one to three years of felling — though this varied depending on seasoning practices and timber availability.
The dendrochronological evidence places the felling of the vessel's primary timbers between 1742 and 1745 — suggesting construction most likely occurred between approximately 1743 and 1748.
This date range is consistent across all five samples and confirms a mid-18th century construction date.
DR. CHEN'S ASSESSMENT
"The timber evidence points strongly toward Iberian — most probably Portuguese — construction using timber assemblages characteristic of Portuguese shipbuilding practice of the period. The absence of any tropical hardwood in the structural, deck, or interior timbers makes Caribbean construction unlikely.
The dendrochronology places timber felling between 1742 and 1745 — consistent with a vessel entering service in the mid-to-late 1740s.
Combined with the wreck position analysis in Evidence File 01 — which indicated a European Atlantic approach — the timber evidence narrows the probable origin to the Iberian Peninsula and almost certainly to a Portuguese port. The cargo analysis will test whether the vessel's contents are consistent with this origin."
YOUR TASK
The wood analysis has established two findings — the vessel was most probably built on the Iberian Peninsula using timber assemblages characteristic of Portuguese shipbuilding, and its primary timbers were felled between 1742 and 1745.
Research Portuguese maritime history in the mid-18th century — what routes did Portuguese merchant vessels sail, what ports did they trade with, and what cargo would a Portuguese brigantine typically carry on a westward Atlantic crossing in the 1740s?
The Caribbean origin has been made significantly less probable but not impossible. The wood evidence points toward Iberian construction — but what would confirm the vessel's port of departure and intended destination?
Consider what the cargo — still largely intact in the hold — might reveal about where this vessel loaded and where it was going. Evidence File 03 will examine what the Santa Catarina was carrying.
EVIDENCE FILE 03 +
EVIDENCE FILE 03 — CARGO ANALYSIS
Case Reference: NOAA-2024-0934
Evidence Item: EV-03 — Cargo identification and chemical analysis
Prepared By: Dr. James Whitfield, Maritime Archaeology Laboratory
Date: October 22
BACKGROUND
The cargo hold contained two distinct categories of material — ceramic storage vessels stacked in the main hold, and a second layer of objects visible beneath the ceramics through a gap in the forward hold planking. Both required careful recovery and analysis. Underwater archaeologists spent three days documenting and recovering representative samples — recording the position of each item before removal.
PART ONE — THE CERAMIC VESSELS
Physical description:
Forty-one ceramic storage vessels were documented in the main hold. Fourteen were intact with seals preserved — the remainder had cracked during the sinking or subsequent centuries on the seabed.
Each vessel is approximately 28 inches tall and 16 inches in diameter at its widest point — a form consistent with Portuguese wine storage amphorae of the 17th and 18th centuries. The ceramic fabric is reddish-brown with a characteristic surface texture.
Chemical analysis of intact vessel contents:
Three intact vessels were carefully opened under laboratory conditions and their contents analyzed.
Finding 1 — Organic biomarkers:
Analysis identified tartaric acid — a compound found almost exclusively in grapes and grape products — alongside other organic acids consistent with fermented grape-based beverages. The presence of tartaric acid is a reliable indicator of wine or wine residue even after centuries of storage.
Finding 2 — Fortification indicators:
Syringol and other phenolic compounds associated with grape spirit — distilled wine alcohol added to fortify wine — were detected in the residue. These compounds are characteristic markers of fortified wine production and are distinct from naturally fermented wine residue.
The combination of grape-derived organic acids and grape spirit markers is consistent with fortified wine — the category that includes Port wine from the Douro Valley and Madeira wine from the island of Madeira. Both were among Portugal's most valuable export commodities in the 18th century and both were widely traded to colonial American ports.
A note on precision: reconstructing the original alcohol concentration from centuries-old submerged residue is not reliably possible. The chemical analysis establishes the presence of fortified wine markers — not precise alcohol content. The identity of the wine as Port or Madeira rather than another fortified wine type is suggested but not confirmed by the organic chemistry alone.
Ceramic fabric analysis:
X-ray fluorescence analysis of the ceramic vessels identified an elemental composition consistent with clay from the Lisbon region of Portugal — specifically the fine-grained alluvial clay associated with Lisbon-area potteries in the 17th and 18th centuries.
The vessels were most probably made in the Lisbon area and filled with fortified wine before loading.
PART TWO — THE SECONDARY CARGO
The objects visible beneath the ceramic vessels required careful excavation. Six representative samples were recovered from the forward hold section where a gap in the planking provided access.
Physical description:
The objects are small rectangular ingots — approximately 8 inches long, 3 inches wide, and 1 inch thick. Their surfaces are darkened and partially oxidized but the underlying material is dense and heavy relative to their size.
Chemical analysis:
X-ray fluorescence analysis identified the primary composition as gold — approximately 91% by mass — with silver at approximately 8% and trace copper. This gold-silver ratio is consistent with naturally occurring gold alloy rather than refined pure gold — the silver content reflects the composition of the ore from which the gold was smelted.
Total secondary cargo estimated:
Gold ingots are small and dense. Based on the dimensions of the visible stack and a conservative estimate of the stacking depth in the forward hold section Dr. Whitfield estimated the secondary cargo at approximately 200 to 300 pounds of gold ingots — a quantity with significant monetary value but physically compact enough to be concealed beneath the primary ceramic cargo.
Gold isotope and trace element analysis — origin assessment:
Gold's trace element and isotope composition varies by geological source and can sometimes be used to suggest probable mining regions — though with less precision than lead isotope analysis.
The gold's silver content and trace element profile were compared against published reference data for known 18th-century Atlantic gold sources.
The composition is broadly consistent with alluvial gold from the Brazilian interior — specifically the general characteristics documented for gold production from the captaincy of Minas Gerais, which was the dominant source of Portuguese colonial gold throughout the first half of the 18th century.
This consistency is suggestive rather than definitive — gold composition data for 18th-century sources is less precisely documented than for some other metals. The analysis cannot rule out other gold sources entirely.
THE GOLD CONCEALMENT
The ingots were stowed beneath the ceramic wine vessels in the forward hold — accessible only by removing the primary cargo. Their position beneath the ceramics is not consistent with legitimate declared cargo stowage — which would typically be documented in the manifest and accessible for inspection.
Dr. Whitfield noted that the forward hold location is significant beyond concealment. Stowing dense heavy cargo low and forward in a vessel affects its trim — the fore-and-aft balance of the hull in the water. An undeclared weight in the forward hold would not have been accounted for in the vessel's stability calculations as filed with port authorities.
"The gold cargo is small enough to be concealed and valuable enough to be worth concealing. Its position beneath the primary cargo suggests deliberate concealment rather than standard stowage. Whether it was declared in the vessel's manifest is a question the documentary record will need to answer — but its physical location is not consistent with cargo the owner expected to be inspected."
GOLD SMUGGLING IN THE 18TH-CENTURY PORTUGUESE EMPIRE
Brazilian gold was the economic foundation of the Portuguese empire in the first half of the 18th century. The Minas Gerais gold rush — which began in the 1690s — transformed Portugal into one of Europe's wealthiest nations and funded enormous construction projects including the Palace of Mafra and the rebuilding of Lisbon after the 1755 earthquake.
The Portuguese Crown imposed strict controls on gold export — requiring all gold to pass through licensed channels, be weighed and taxed at royal collection points, and be transported in the licensed annual fleet. Unlicensed gold export — bypassing the royal fifth tax and the fleet system — was a serious criminal offense.
Despite strict controls gold smuggling was a persistent and documented problem throughout the 18th century. Small quantities of gold — easily concealed in personal luggage, cargo holds, or ships' stores — regularly left Brazil outside the licensed system. Merchants, ship captains, and colonial officials were all documented participants in unlicensed gold movement.
A compact quantity of gold ingots beneath false cargo in a merchant vessel's forward hold is entirely consistent with documented patterns of colonial gold smuggling in this period.
YOUR TASK
The cargo analysis has identified two layers — a primary cargo of Portuguese fortified wine in Lisbon-made ceramic vessels, and a concealed secondary cargo of gold ingots with a composition broadly consistent with Brazilian colonial gold, stowed beneath the primary cargo in the forward hold.
Research the Portuguese colonial gold trade and the Crown's regulation of Brazilian gold exports in the 18th century. Consider what the concealment of the gold ingots beneath the primary cargo tells you about whether this secondary cargo was declared to Portuguese authorities.
The wine cargo is consistent with a legitimate Portuguese merchant voyage to colonial America. The gold raises a different question.
Research what Brazilian gold meant to the Portuguese Crown in the 1740s — and why a merchant captain might risk smuggling it across the Atlantic. Consider also what an undeclared weight in the forward hold would have done to the vessel's handling in severe storm conditions — and whether the concealment of this cargo may have contributed to the vessel's loss.
Evidence File 04 will examine the artifacts recovered from the wreck — navigation instruments, personal possessions, and ceramic fragments — to help establish the vessel's identity and destination more precisely.
EVIDENCE FILE 04 +
EVIDENCE FILE 04 — ARTIFACT ANALYSIS
Case Reference: NOAA-2024-0934
Evidence Item: EV-04 — Recovered artifacts and material culture analysis
Prepared By: Dr. Elena Vasquez, Maritime Archaeology Team
Date: October 28
BACKGROUND
Beyond the cargo the wreck contained personal possessions, navigation instruments, ship's equipment, and ceramic fragments that survived three centuries on the seabed. Each artifact carries information about the vessel's origin, its crew, its destination, and the period in which it sailed. Dr. Vasquez catalogued 47 individual artifacts recovered during five days of systematic excavation. This file documents the most significant findings.
ARTIFACT GROUP 1 — NAVIGATION INSTRUMENTS
Item N1 — Octant:
A navigational octant — an instrument used to measure the angle of celestial bodies above the horizon for position fixing — was recovered from what appears to have been the captain's cabin area in the stern.
The instrument is heavily corroded but partially intact. The arc is engraved with degree markings. A maker's mark — partially legible through careful cleaning — reads "J. Ferr — Lisboa" — consistent with the workshop of João Ferreira, a Lisbon instrument maker active between approximately 1730 and 1765.
The octant was invented in 1731. Its presence aboard this vessel is consistent with a vessel sailing after that date — and the Lisbon maker's mark confirms Portuguese origin.
Item N2 — Traverse board:
A wooden traverse board — used by sailors to record compass headings and distances sailed during a watch — was recovered in fragmentary condition. The compass rose painted on the board uses Portuguese cardinal direction notation — Norte, Sul, Este, Oeste — confirming the vessel's Portuguese crew.
ARTIFACT GROUP 2 — PERSONAL POSSESSIONS
Item P1 — Ceramic tableware:
Fourteen fragments of blue and white ceramic tableware were recovered from the stern cabin area. The decoration style and ceramic fabric are consistent with Portuguese faience — tin-glazed earthenware produced in Lisbon and Porto workshops in the 17th and 18th centuries. The decorative motifs — stylized floral patterns with blue cobalt pigment on white glaze — are characteristic of Portuguese faience of the 1730s to 1750s.
Item P2 — Pewter spoons:
Four pewter spoons were recovered. One retains a partial maker's touch mark consistent with Portuguese pewter manufacture of the mid-18th century.
Item P3 — Leather shoe:
A single leather shoe — men's, European construction — was recovered in good condition from an anaerobic sediment pocket that had excluded oxygen and marine organisms. The construction style is consistent with Portuguese or southern European manufacture of the mid-18th century.
Item P4 — Silver coin:
A single silver coin was recovered from sediment beneath the captain's cabin area. The coin is a Portuguese cruzado — a denomination minted in Lisbon. The reverse bears the royal arms of Portugal under King João V. Mint marks date the coin to between 1740 and 1750 — providing a hard terminus post quem. The vessel could not have sunk before 1740 since it carried a coin minted after that date.
ARTIFACT GROUP 3 — SHIP'S EQUIPMENT
Item E1 — Iron anchor components:
Fragments of iron anchor stock were recovered from the bow area. The anchor design — a wooden-stocked iron anchor — is consistent with mid-18th century Portuguese and broader European maritime practice.
Item E2 — Hull protection evidence:
Sections of the lower hull showed evidence of sacrificial wooden sheathing — an additional layer of planking applied over the primary hull planking to protect against marine boring organisms such as Teredo navalis, the shipworm that devastates untreated wooden hulls in warm Atlantic waters.
Sacrificial wooden sheathing — sometimes combined with a layer of tar and hair between the planking layers — was the standard anti-fouling method used on European merchant vessels throughout the 17th and early 18th centuries. It is entirely consistent with a vessel built and operating in the 1740s.
Item E3 — Rigging hardware:
Iron deadeyes and chainplates recovered in corroded but identifiable condition are consistent with a brigantine-rigged vessel of approximately 85 feet — matching the hull dimensions recorded during initial survey.
ARTIFACT GROUP 4 — CERAMIC CARGO FRAGMENTS
Fragments of broken ceramic cargo vessels recovered from the hold were analyzed for maker's marks and production origin. Three fragments retained partial stamp marks on their bases.
The marks were compared against a reference database of Portuguese pottery marks maintained by the Museu Nacional do Azulejo in Lisbon.
Two fragments matched workshop marks associated with a Lisbon pottery operating between 1738 and 1762.
One fragment matched a workshop mark from a pottery in Vila Nova de Gaia — the town directly across the Douro River from Porto, historically the center of Port wine production and export. Ceramic vessels for Port wine export were typically sourced from potteries close to the wine production and bottling facilities in Vila Nova de Gaia.
DR. VASQUEZ'S ASSESSMENT
"The artifact assemblage confirms the picture established by the timber and cargo analysis. The navigation instruments, personal possessions, coinage, ceramic tableware, and cargo vessel marks are all consistent with Portuguese manufacture and Portuguese maritime practice of the mid-18th century.
The coin terminus post quem places the sinking after 1740. The dendrochronology places construction between 1743 and 1748. The sacrificial wooden sheathing is entirely consistent with mid-18th century practice. Together these constraints place the vessel's active service in the late 1740s or 1750s.
The Vila Nova de Gaia pottery mark strongly suggests the vessel loaded its wine cargo in the Porto area — the historic center of Port wine export — before departure. A vessel loading Port wine in Vila Nova de Gaia would be departing from the Porto-Vila Nova de Gaia waterfront — one of the most active wine export points in 18th-century Portugal.
One detail warrants particular attention. The Lisbon-made octant by João Ferreira suggests the captain equipped himself with quality navigation instruments — consistent with an experienced captain preparing for a trans-Atlantic crossing. Whatever happened to this vessel it was not lost through navigational incompetence or inadequate preparation."
YOUR TASK
The artifact analysis has confirmed Portuguese origin, mid-18th century construction, Porto-area wine loading, and a post-1740 sinking date.
Consider what the complete physical picture now looks like — a Portuguese brigantine built in the 1740s, loaded with Port wine in the Porto area and gold ingots concealed in the forward hold, crossing the Atlantic westward toward colonial American ports, coming to rest on the New Jersey outer shelf.
The Vila Nova de Gaia pottery mark connects the vessel to the Port wine trade. The gold composition analysis in Evidence File 03 pointed toward Brazilian colonial origin for the secondary cargo.
Research the Port wine trade between Portugal and colonial America in the mid-18th century — which American ports received Portuguese wine shipments and what the typical trans-Atlantic voyage looked like. Consider also what route a vessel loading in Vila Nova de Gaia would take — and what the final leg of a trans-Atlantic voyage approaching the American coast in autumn looked like for an 18th-century navigator.
The physical evidence has established almost everything the wreck can tell us directly. One question remains — can the documentary record identify this specific vessel, confirm its destination, and shed light on what happened during its final voyage?
Evidence File 05 will search historical shipping archives, colonial port records, and period newspapers for a vessel matching every parameter the physical evidence has established.
EVIDENCE FILE 05 +
EVIDENCE FILE 05 — HISTORICAL RECORDS AND VOYAGE
RECONSTRUCTION
Case Reference: NOAA-2024-0934
Evidence Item: EV-05 — Documentary research and vessel identification
Prepared By: Dr. Marcus Webb, Historical Maritime Research Unit
Date: November 4
BACKGROUND
The physical evidence has established a precise profile — a Portuguese brigantine built between 1743 and 1748, loaded with Port wine in the Porto area and a concealed secondary cargo of gold ingots, crossing the Atlantic westward toward colonial American ports, coming to rest on the outer New Jersey shelf after 1740.
Dr. Webb searched Portuguese shipping archives, colonial American port records, and period newspaper accounts for vessels matching this profile.
SEARCH PARAMETERS
Based on the physical evidence Dr. Webb defined the following search criteria:
Portuguese brigantine — approximately 85 feet in length
Registered in Lisbon or Porto
Primary cargo of Port wine — approximately 41 ceramic vessels
Departure from Porto or Lisbon
Destination — colonial American port — most likely Philadelphia based on established Port wine trade routes
Loss date — between 1746 and 1760 based on construction date and coin terminus
No confirmed arrival record at destination
PORTUGUESE SHIPPING ARCHIVES
Dr. Webb accessed records from the Arquivo Histórico Ultramarino in Lisbon and the Arquivo da Câmara Municipal do Porto.
Shipping manifests from Portuguese ports for the period 1746 to 1760 were searched for westbound Atlantic voyages matching the search parameters.
Three vessels were identified as potential candidates:
Candidate 1 — Nossa Senhora do Rosário
Portuguese brigantine — registered Porto — departed Porto September 1751 — cargo declared as wine and textiles — destination Philadelphia — vessel length recorded as approximately 80 feet — no arrival record found in Philadelphia port records for the following six months.
This vessel matches several parameters — Portuguese brigantine, wine cargo, Philadelphia destination, no confirmed arrival. However the declared cargo includes textiles — not identified in the wreck's hold — and the vessel length is slightly smaller than the wreck's estimated 85 feet. The match is possible but incomplete.
Candidate 2 — São Francisco Xavier
Portuguese brigantine — registered Lisbon — departed Lisbon October 1753 — cargo declared as olive oil and wine — destination Boston — vessel length not recorded — arrived Boston January 1754.
This vessel arrived safely and is eliminated.
Candidate 3 — Santa Catarina
Portuguese brigantine — registered Lisbon — departed Porto October 1748 — cargo declared as Port wine — 41 ceramic vessels — destination Philadelphia — vessel length recorded as 26 braças — approximately 85 feet — captain recorded as Bartolomeu Sousa e Castro — no arrival record found in Philadelphia port records — declared lost at sea March 1749.
This vessel matches multiple parameters precisely — Portuguese brigantine, 85-foot length, 41 ceramic vessels of Port wine, Philadelphia destination, no confirmed arrival, declared lost.
THE SANTA CATARINA — MANIFEST DETAILS
Dr. Webb located the Santa Catarina's manifest in the Porto municipal archive — a handwritten document dated October 3, 1748.
Vessel name: Santa Catarina
Vessel type: Brigantine
Registration: Lisbon
Owner: Companhia dos Vinhos do Porto
Captain: Bartolomeu Sousa e Castro
Declared cargo: Port wine — 41 ceramic vessels
Declared destination: Philadelphia, Pennsylvania
Departure date: October 7, 1748
Crew: 14 men
What the manifest does not declare: any metal cargo of any kind. The manifest lists wine only. No gold. No ingots. No secondary cargo of any description.
COLONIAL AMERICAN PORT RECORDS
Philadelphia port authority archives for the period October 1748 to March 1749 show no arrival record for the Santa Catarina or any vessel matching her description.
A notation in the Philadelphia customs ledger dated January 1749 reads:
"The brigantine Santa Catarina of Lisbon — expected October last — cargo of Port wine — not yet arrived — believed lost."
The Philadelphia merchant James Hartley — who had contracted to receive the cargo — filed a maritime insurance claim in February 1749 documenting the expected delivery and its non-arrival.
NEWSPAPER ACCOUNTS — THE NOVEMBER 1748 ATLANTIC STORM
Dr. Webb identified documentary evidence of a significant meteorological event in November 1748 — within the timeframe of the Santa Catarina's crossing.
The Pennsylvania Gazette — November 24, 1748:
"Accounts have been received from several vessels lately arrived at this port of a most violent storm encountered in the western Atlantic during the first weeks of November — several vessels reported severe damage and two are known lost — the conditions were described by survivors as among the worst in living memory for that season."
The Boston Evening Post — December 6, 1748:
"We learn from the captain of the sloop Endeavour, arrived here last week from Bermuda, that he encountered a storm of extraordinary violence in the western Atlantic in early November — winds of exceptional force from the northwest — his vessel sustained significant damage to her rigging and was driven considerably south of her intended course before conditions moderated."
The New-York Weekly Journal — December 12, 1748:
"Several vessels are reported overdue from European ports — among them the Portuguese wine ship Santa Catarina bound for Philadelphia — her owners have expressed concern for her safety following reports of the November storm."
ASSESSMENT — THE CANDIDATES COMPARED
Dr. Webb summarized the match between each candidate vessel and the physical evidence:
Nossa Senhora do Rosário matches on vessel type, cargo category, destination, and non-arrival. It does not match precisely on cargo quantity, vessel length, or departure date. It remains a possible but incomplete match.
Santa Catarina matches on vessel type, length, exact cargo quantity — 41 ceramic vessels — destination, non-arrival, and departure timing consistent with the November 1748 storm window. The manifest silence on any secondary cargo is consistent with — though does not confirm — the concealed gold identified in Evidence File 03.
Neither candidate can be definitively confirmed from the documentary record alone. Physical evidence and documentary evidence must be weighed together.
ONE UNRESOLVED QUESTION
The physical evidence identified a concealed secondary cargo of gold ingots in the forward hold — not declared in any manifest examined. Dr. Webb searched Portuguese customs and trade records for evidence of unlicensed gold movement in the 1740s.
Gold smuggling investigations from the Casa da Índia — the Portuguese royal trading house — document numerous inquiries into suspected unlicensed gold exports from Brazil throughout the 1740s. Several merchant vessels operating the Porto-Philadelphia route were subjects of such inquiries during this period.
Whether the Santa Catarina specifically was among those suspected cannot be confirmed from the available records — the relevant inquiry files for 1748 are incomplete in the archive. The physical evidence of concealed gold stowed beneath false cargo in the forward hold is the strongest indicator available that the secondary cargo was not declared to Portuguese authorities.
YOUR TASK
You now have all five Evidence Files.
Ocean current analysis established the wreck's position is consistent with a European vessel on a westward trans-Atlantic crossing. Wood analysis identified probable Portuguese construction from the 1740s. Cargo analysis found Port wine and concealed gold ingots. Artifact analysis confirmed Portuguese origin and Porto-area departure. And the documentary record has produced two candidate vessels — with the Santa Catarina matching the physical evidence more precisely than any alternative.
Using evidence from all five files — which vessel do you believe this wreck most likely is, and why? Build your case using both the physical evidence and the documentary record — identifying which parameters match, which are uncertain, and what weight you give each piece of evidence.
Consider the concealed gold cargo. The manifest of the Santa Catarina declares 41 ceramic vessels of wine — exactly the number found in the hold. It declares nothing else. The forward hold contained gold ingots beneath the primary cargo.
What does the combination of the precise cargo match and the manifest silence on any secondary cargo tell you — and what role might the undeclared forward hold weight have played in the vessel's fate during the November 1748 storm?
The ocean kept her secret for 276 years. You have the science and the history.
What happened to the Santa Catarina?
HAVE YOU SOLVED THE CASE?
Review the evidence and decide what you think happened. If you're investigating with others, discuss your findings and agree on your final verdict before revealing the answer.
Once your team has reached a conclusion, reveal the answer.