Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
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[1]research packet 936-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: PHANTOM
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-766-pc766-pkt-936-packet-md
-
[2]NARA, RG 24 'Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities', File Unit 'SC-766, 11/14/42-12/30/42', NAID 192200343 (Roll 6885; microfilm reel 68825), 27 digitized images via Ancestry partnership [other_primary]
- Locator
- NAID 192200343, images 4-10 of 27 (forwarding sheets 22 Nov and 30 Dec 1942; commissioning Report of Changes pages 1-2)
- Finding type
- vessel_history
- Finding
- Primary record of this hull's entire U.S. Navy commission. The roll's forwarding sheet is headed 'MUSTER ROLL OF THE CREW OF THE U.S.S. SC766', dated 30 December 1942, hand-annotated 'comm 11-14-42 to 12-30-42 decomm', certified by Ensign Frank B. Ingersoll Jr., USNR (Executive Officer), approved and forwarded 30 December 1942 by Lt.(jg) D. E. Wilson, USNR, Commanding Officer. The embedded Commissioning Report (Report of Changes, N. Pers. 5b) is for 'the month ending 14th day of November, 1942' and lists the 21-man enlisted nucleus crew (ratings incl. CBM, EM1c, MM2c, MoMM2c, GM2c, CMM(AA), RM3c, QM3c, SM3c, Y3c, SC3c, SoM3c, F3c, S2c, AS): 20 'Received November 14, 42' and one (row 5, SoM3c) 19 November, all from 'RS Boston, Massachusetts'. An earlier forwarding sheet dated 22 November 1942 (XO Ensign E. H. Schock) is likewise headed 'U.S.S. SC766'.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-11-14 to 1942-12-30
- Population
- 21 enlisted commissioning crew + ~3 officers (Nov-Dec 1942)
- Limitations
- Establishes commissioning date, decommissioning date, designation in use (SC766, not PC-766), and crew size/composition - it does NOT contain any material, construction, or asbestos information. The roll covers only the 46-day U.S. commission; nothing post-transfer is aboard-documented. Names/ratings transcribed from film images; no transcription has been contributed to the catalog record.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-01
-
[3]NavSource Online: Submarine Chaser Photo Archive, SC-766 ex-PC-766 - designation timeline, specifications, disposal note (verified live via firecrawl) [other_primary]
- Locator
- NavSource 12/150766.htm header block, timeline, specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull ('SC-766 ex-PC-766', 'served the Navies of the United States and Brazil'): laid down 9 April 1942 by W. A. Robinson, Inc., Ipswich, MA; launched 27 October 1942; 'Commissioned USS PC-766, 11 November 1942'; transferred to Brazil 31 December 1942 and named Juruena (CS 54); 'Reclassified SC-766 by the U.S. Navy in April 1943'; reclassified J-4 after WWII; decommissioned 9 May 1952; fate unknown. Spec block: 148 t., 110'10", 17' beam, 6'6" draft, 15.6 kts, complement 28; armament one 3"/23 mount, two 20mm, two Mousetrap and two K-Gun depth-charge projectors, two depth-charge tracks; propulsion two 880bhp General Motors 8-268A diesels, Snow and Knobstedt single reduction gear, two shafts. Page states explicitly: 'There is no DANFS history available for SC-766.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1952
- Population
- W. A. Robinson construction trades (Apr-Nov 1942); US crew (Nov-Dec 1942); Brazilian crews (1942-c.1952)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry. Two of its claims conflict with the hull's own muster roll (NAID 192200343): commissioning 11 Nov vs the roll's 'comm 11-14-42', and 'commissioned USS PC-766 / reclassified SC-766 April 1943' vs the roll's 'U.S.S. SC766' usage in Nov-Dec 1942 (see correction row ev-03). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-02
-
[4]NARA muster roll NAID 192200343 (primary) vs NavSource 12/150766.htm timeline (secondary) - commissioning date and designation corrections [other_primary]
- Locator
- NAID 192200343 images 5 and 9 ('U.S.S. SC766' headings; 'comm 11-14-42'; crew 'Received November 14, 42'); NavSource timeline lines 'Commissioned USS PC-766, 11 November 1942' / 'Reclassified SC-766 ... April 1943'
- Finding type
- historical_record
- Finding
- CORRECTION (two points). (1) Commissioning date: the ship's own muster-roll forwarding sheet and commissioning Report of Changes record 'Comm. date 11-14-42' with the 21-man enlisted nucleus received aboard 14 November 1942 (one man on 19 November) from RS Boston - the prompt-circulating 'DANFS' attribution is wrong twice over: no DANFS entry exists for this hull (NavSource states this explicitly and none is indexed at NHHC/hazegray), and NavSource/NGB/uboat.net/Shipbuilding History all print 11 November 1942. The primary document supports 14 November 1942; 11 November is probably the builder's delivery date. (2) Designation: NavSource carries 'Commissioned USS PC-766 / Reclassified SC-766 by the U.S. Navy in April 1943' - but both surviving muster-roll forwarding sheets (22 Nov and 30 Dec 1942) are headed 'U.S.S. SC766', i.e., the SC-766 designation was in shipboard use from commissioning, months before the formal reclassification NavSource describes.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1943 (designation window)
- Limitations
- Corrects secondary-source dates/designations against a primary record; does not resolve which designation appeared on the formal commissioning instrument or reclassification directive - the April 1943 reclassification may be a ledger action ratifying existing usage. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-03
-
[5]Navios de Guerra Brasileiros (NGB), 'Caca Submarino Juruena - CS 54/J 4' - Brazilian service history citing SDGM Repositorio de Nomes dos Navios da Esquadra Brasileira (3rd ed., 1959) and Saldanha da Gama, A Marinha do Brasil na Segunda Guerra Mundial (1982) (verified live via firecrawl) [other_primary]
- Locator
- naval.com.br/ngb/J/J052/J052.htm - 'Datas' table, 'Historico' 1943/1945/1946/1951 sections, convoy and commander tables
- Finding type
- vessel_history
- Finding
- Brazilian service for this hull: dates table records keel 9 April 1942, launch 27 October 1942, USN incorporation 11 November 1942, USN baixa (struck/departed) 30 December 1942, Brazilian incorporation 30 December 1942, Brazilian baixa 1951. Prose: transferred and incorporated into the Brazilian Navy 30 December 1942 in a ceremony at Miami, Florida, first CO Capitao-Tenente Manoel Joao de Araujo Neto; retained at Miami as training ship for Brazilian crews; 29 March 1943 sailed for Key West as flagship of a task group (with CS Jacui CS-57 and CS Jundiai CS-58) under Capitao-Tenente Arthur Oscar Saldanha da Gama; 8-12 June 1943 mixed US-Brazilian escort of convoy Key West-Guantanamo Bay KG-638 alongside USS SC-675, SC-656, SC-500, SC-1276, SC-1277, SC-1034; 13 June convoy GAT-68 to Trinidad (arrived 19 June); 3 July departed Trinidad with first Trinidad-Recife convoy TJ-1, arriving Recife 14 July 1943. Total WWII record: 50 convoy-escort commissions (TJ 1, Rio/Recife 17, Recife/Rio 17, other 15). 29 December 1945 subordinated to the Diretoria de Hidrografia e Navegacao; 1946 lighthouse-inspection commission in the south (Florianopolis, Naufragados, Ilha da Paz, Conchas, Bom Abrigo, Moela); 'Deu baixa do servico' 1951. The eight Brazilian SCs formed the 'J' class, nicknamed 'caca-paus' (wood-chasers). Acquisition cost of the class in 1942-43: US$500,000 per unit.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1951
- Population
- Brazilian crews, wartime escort and training service (1942-45); hydrographic/lighthouse service (1945-51)
- Limitations
- NGB is a volunteer-compiled repository citing official Brazilian Navy sources (SDGM name registry; official WWII history) - secondary but specifically sourced. One internal conflict: its dates table gives USN incorporation 11 Nov 1942 while the prose says 11 December (the table is consistent with all other sources; the prose December is a typo). Brazilian-spec block (GM 16-184A 'Pancake' diesels, 1,200 bhp, 21 kt, 98t std/130t loaded, complement 27) conflicts with NavSource (see gaps). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-04
-
[6]Shipbuilding History (Tim Colton), W. A. Robinson yard table, Ipswich MA - SC-766 build row (verified live via firecrawl) [other_primary]
- Locator
- shipbuildinghistory.com/shipyards/emergencysmall/robinsonma.htm, W. A. Robinson table row for SC 766
- Finding type
- historical_record
- Finding
- W. A. Robinson yard list row for this hull: 'SC 766, US Navy, Sub Chaser, 136 [tons], 110 [ft], 11-Nov-42, To Brazil 1943 as Juruena (CS 54)' - one of six consecutive Brazilian-bound SCs (SC 762-767) built at the yard. Yard context: William A. Robinson bought an existing small shipyard on Fox Creek near Ipswich in 1937 to build wooden sailing vessels; the yard built over 200 wartime vessels (incl. LCMs and ~75 listed small ships) and was razed after the war when Robinson closed the business.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942
- Population
- W. A. Robinson construction trades (1942)
- Limitations
- Respected secondary compilation of US shipbuilding output; its date column reads as delivery/commissioning month-year and here gives 11-Nov-42 (the delivery-date side of the 11-vs-14 conflict). 'To Brazil 1943' is off by 1-3 days vs the 30-31 Dec 1942 transfer - normal year-boundary rounding in a yard list. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-05
-
[7]Splinter Fleet (Theodore R. Treadwell, author of 'Splinter Fleet: The Wooden Subchasers of World War II', Naval Institute Press), SC-497-class facts/specifications page; NavSource SC photo index (PC/SC numbering and class context) (verified live via firecrawl) [other_primary]
- Locator
- splinterfleet.org facts-and-specifications table (WWII SC-497 column) and Facts list; navsource.net/archives/12/01idx.htm (PC-461 series listing) and 15idx.htm (SC index 'ex-PC' annotations)
- Finding type
- vessel_history
- Finding
- Class context: 438 wooden-hulled SC-497-class submarine chasers completed 1941-44 by roughly fifty small boatyards (steel was allocated to carriers/destroyers; wooden construction let small yards build them in 60-120 days); class standard complement 3 officers + 24 enlisted; engines two GM 8-268-A straight-8 diesels (1,440 hp) or two GM 16-cylinder 184-A 'pancake' diesels; speed 15.6 or 21 knots depending on fit; 1,500 nm at 12 knots. 142 SCs went to allies under Lend-Lease: 78 USSR, 50 France, 8 Brazil, 3 Norway, 3 Mexico. The NavSource SC index shows the interleaved PC/SC numbering (numerous SCs listed as 'ex-PC-###'), confirming PC-766 was a wooden-subchaser contract designation, never a PC-461-class steel patrol craft - PC-461 hulls ran in series 461-496, 542-627, 776-826, 1077-1265, none of which contains 766.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- class-wide construction and crew populations (context)
- Limitations
- Class-level context, not a hull record - it documents what the type was, not this hull's specific equipment or materials. The 'not a PC-461' correction rests on the numbering-series arithmetic plus NavSource's own 'ex-PC-766' convention. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-06
-
[8]Era inference built on: NavSource spec block (two 880bhp GM 8-268A diesels, wooden 110-ft hull); Splinter Fleet class facts; NGB Brazilian-era characteristics; shipboard document set (NARA muster roll shows 46-day US commission only) [other_primary]
- Locator
- NavSource spec block; splinterfleet.org facts-and-specifications; NGB characteristics block
- Finding type
- asbestos_application
- Finding
- A wooden-hulled diesel subchaser built in 1942 carried no steam plant, boilers, or high-energy steam piping - eliminating the boiler/turbine lagging pathway that dominates asbestos content in steam vessels. Era-standard applications aboard a small diesel craft of this period were engine-exhaust lagging, gaskets, valve packing, and electrical insulation - the low-intensity end of the WWII naval asbestos spectrum. Her U.S. Navy crew exposure window was 46 days; the far longer exposure window is the Brazilian career (1942-c.1952), which is outside U.S. documentation channels.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-c.1952
- Population
- W. A. Robinson construction trades (1942); US crew (Nov-Dec 1942); Brazilian crews (1942-c.1952)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or builder's spec sheet located for SC-766/PC-766. Names era-standard applications, not confirmed installed materials; no quantity; no manufacturer attribution for this hull. The wooden hull and diesel plant bound the maximum plausible scope but do not prove any specific product was or was not present.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO HRD-80-2 full text: transmittal letter and 'Navy's policy on use of asbestos' section (attachment-1 discussion, 'all ships' enumeration)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships: 'each ship has several types of asbestos containing materials installed; however, thermal insulation for machinery, equipment and piping systems has been the major application of asbestos,' and 'all ships presently in service contain some quantity of asbestos' - non-thermal shipboard applications named are electrical resistors, deck tiling, galley-range cabling, piping-system gaskets and packing, and brakes/clutches; 'nearly impossible to build a Navy ship free of the mineral.' Thermal-insulation specs were revised to asbestos-free in 1973, yet some ships were delivered with asbestos insulation as late as May 1978. Spans this hull's construction (1942) and both navies' service era.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. The 'all ships' enumeration postdates this hull's 1942 US departure but describes Navy shipboard asbestos applications generically. Full text retrieved this session via firecrawl on gao.gov/assets/hrd-80-2.pdf (plain curl is 403-blocked, standing defect; firecrawl succeeds).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-08
-
[10]Batch-8139 search ledger (this record): NARA catalog + muster-roll images; NavSource SC and PC indexes; NGB Brazilian repository; Shipbuilding History; Splinter Fleet; uboat.net; CourtListener base queries; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-pc-766-01 through -12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or litigation naming SC-766, PC-766, or Juruena (CS 54/J-4) was found in the public sources searched. Secondary web sweeps surfaced no qualifying case and no law-firm listicle content naming this hull at all - consistent with a 46-day US career and immediate foreign transfer. The hull's own NARA muster roll, fully digitized, contains no material-condition content by design.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. Undigitized leads remain: builder construction files for W. A. Robinson (yard closed post-WWII), BuShips plans/specifications for the SC-497 class (RG 19), Brazilian Navy disposal records for Juruena post-1951/52, and any Brazilian asbestos survey of the class. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-766-09