Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
-
[1]research packet 900-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-sc-512-sc512-pkt-900-packet-md
-
[2]NavSource Online Submarine Chaser Photo Archive, SC-512 page (hull timeline, specification block, post-service ownership chain) [other_primary]
- Locator
- SC-512 page, timeline block and Specifications block, navsource.net/archives/12/150512.htm
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 12 August 1941 by the American Cruiser Co., Detroit, MI; launched 26 March 1942; delivered 10 July 1942 and commissioned USS PC-512 under LT Lawrason Riggs, III, USNR; reclassified SC-512 in April 1943; transferred to the Coast Guard 24 October 1945 and commissioned USCGC Air Condor (WAVR 414); sold 17 January 1948; 1949 to Tideland Service, Inc. of New Orleans as yacht Argo; 1950 to Ralph Calvert of Pensacola, FL as fishing boat; 1963 to Reginald E. Brown of La Marque, TX; 1967 to Bay Boats, Inc. of Kemah, TX; burned 21 November 1967 approximately 2 miles off the Texas coast. Specifications: 148 t, 110'10" x 17' x 6'6", 21 kts, complement 28, one 40mm mount + two .50 cal + two Y-guns + two depth-charge tracks, two GM EMD 16-184A 1,540-bhp diesels, two shafts. Page explicitly notes 'There is no DANFS history available for SC-512'.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1967
- Population
- Wartime complement ~28 (class spec); USCG Air-sea-rescue crew 1945-48; civilian owners/crew 1948-67
- Limitations
- Volunteer-maintained secondary archive with no inline primary citations; the 1948-1967 ownership chain and the 1967 burning are single-source here. Establishes identity, milestones, and configuration only - no asbestos, material, or personnel-exposure information.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-01
-
[3]uboat.net Allied Warships entry, USS SC-512 (SC-512): milestone table, commanding-officer list, and event record [other_primary]
- Locator
- uboat.net/allies/warships/8816.html - milestone table, 'Commands listed' block, 'Notable events' entry of 8 Oct 1944
- Finding type
- vessel_history
- Finding
- uboat.net warship entry corroborates the build record (ordered 1 April 1941; laid down 12 August 1941; launched 26 March 1942; commissioned 10 July 1942; end of U.S. service 24 October 1945, transferred to the Coast Guard) and lists five wartime COs: L. Riggs 3rd USNR (Jul 1942-early 1943), H. S. B. Gwin USNR (early 1943-mid/late 1943), W. V. Ross USNR (mid/late 1943-mid/late 1944), C. H. Stevenson USNR (mid/late 1944-early 1945), M. L. Wallace USNR (early 1945-31 Jul 1945). One documented operation: 8 October 1944 SC-512 (Lt.(jg) C. H. Stevenson USNR) escorted submarine USS Kraken (SS-370) from New Orleans into the Gulf of Mexico, staying with her to 21 deg 01'N, 83 deg 30'W after Coast Guard patrol craft CG 83459 and CG 83468 parted company at 28 deg 45'N, 89 deg 43'W - consistent with Gulf Sea Frontier duty.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1945
- Population
- Wartime crew ~28; five successive commanding officers (USNR)
- Limitations
- Secondary compilation derived from patrol reports and Navy registers; CO turnover dates are approximations by design ('early', 'mid/late'). Does not establish any asbestos fact; operational coverage of the hull's career is partial - no other events are documented.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-02
-
[4]U.S. Coast Guard, 'U.S. Coast Guard "W" Numbers', James Flynn, CG-09224 (revised March 2014; originally published in The Belgian Shiplover) - official USCG hull-designation register [other_primary]
- Locator
- Flynn 'W' Numbers table, entry WAVR 414 (Air Condor), p. -4- of the register
- Finding type
- vessel_history
- Finding
- The official U.S. Coast Guard 'W' numbers register lists 'WAVR 414 Air Condor ex. SC-512' - confirming the hull's transfer out of Navy service and her Coast Guard designation/name as an Air-class air-sea-rescue cutter. The same register lists 70+ sister WAVR-designated Air-class cutters all annotated 'ex. SC-xxx', corroborating the SC-497-class air-sea-rescue conversion program.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945-1948
- Population
- USCG crew 1945-1948
- Limitations
- Register gives designation, name, and ex-Navy hull number only - no dates, stations, service detail, or material information. media.defense.gov returns 403 to direct automated fetch; content verified via firecrawl extraction of the live URL and against the Wayback capture 20250718104036 - PDF text layer reads 'WAVR 414'.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-03
-
[5]National Archives Catalog file unit 'SC-512, 7/11/42-7/31/45' (NAID 192740789), Roll 6721, Record Group 24 (Records of the Bureau of Naval Personnel), series Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities - 163 digitized images [other_primary]
- Locator
- catalog.archives.gov/id/192740789 - file-unit page, RG 24 / Roll 6721
- Finding type
- historical_record
- Finding
- The hull's Navy muster rolls are digitized and public: 163 images covering 11 July 1942 through 31 July 1945 - essentially her entire commissioned Navy career (commissioned 10 July 1942; muster file titled 'SC-512' though it opens while she still carried the PC-512 designation). This is the ship-specific personnel record from which individual crew rosters can be reconstructed.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-07-11 to 1945-07-31
- Population
- All hands assigned to PC-512/SC-512, Jul 1942-Jul 1945 (~28 billets)
- Limitations
- Muster rolls are personnel rosters - names, rates, and reporting/detachment dates only. They contain no asbestos, material, medical, or exposure data; they evidence who was aboard, not what they were exposed to. Deck logs for this hull were not located in the digitized NARA logbook series.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-04
-
[6]Shipbuilding History (Tim Colton), 'American Cruiser Works' emergency-builder yard register and production table [other_primary]
- Locator
- shipbuildinghistory.njscuba.net/us-emer-small/americancruiser/ - production table row O/N 258191; cf. aggregate table shipbuildinghistory.njscuba.net/us-navy-small/pc2/ ('American Cruiser, Detroit MI')
- Finding type
- historical_record
- Finding
- Colton's builder register carries this hull as '258191 | SC-512 | US Navy | subchaser | 136 LDT | 110 LOA | delivered 10 Jul 1942 | to USCG 1945 as Air Condor (WAVR-414), sold 1948 as Argo' - corroborating the delivery date, the USCG transfer year and name, the 1948 sale, and the Argo name, and supplying her U.S. documented-vessel official number 258191. The same register locates the builder at Riverside, MI and notes 'I can find no information about this company', while NavSource/uboat.net/navypedia (and Colton's own aggregate SC table) say American Cruiser Co., Detroit, MI - an unresolved builder-name/location conflict.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1948
- Population
- American Cruiser Works construction trades (1941-42); later merchant-documented owners
- Limitations
- Independent secondary register, not a government record; the official number 258191 and the Riverside yard location could not be confirmed in a primary source this session. The register's own author flags the company as undocumented.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-05
-
[7]NavSource Submarine Chaser (SC) index - SC-497 class description; NavSource SC-512 specification block (wooden hull, twin GM diesel plant); corroborated by uboat.net class data [other_primary]
- Locator
- navsource.net/archives/12/15idx.htm class header; navsource.net/archives/12/150512.htm specifications block
- Finding type
- asbestos_application
- Finding
- This hull is one of the wooden-hulled, 110-foot, diesel-driven SC-497-class submarine chasers mass-built at small yards 1941-1944 (NavSource index states 'Five hundred eighty SC-497 Class wood-hulled... Submarine Chasers were built during World War II'). Aboard a wooden diesel patrol craft of this era the asbestos-relevant systems were confined to machinery: era-standard applications were diesel engine and exhaust lagging, machinery-space thermal insulation, gaskets and valve packing, and electrical insulation. There is no steam plant, so the boiler/turbine lagging pathway of steam vessels does not apply; the confined-space engine-room exposure dynamic of a 110-foot hull applies directly.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1967
- Population
- Construction trades at American Cruiser (1941-42); engine-room and maintenance ratings aboard (~28 complement, 1942-48); civilian owners 1948-67
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or builder specification located. Names era-standard candidate applications, not confirmed installed materials; no quantity, no manufacturer attribution. The wooden hull and diesel plant narrow the candidate set relative to steam combatants but do not eliminate it.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-06
-
[8]GAO HRD-80-2, 'Asbestos in Naval Ships' review of Navy worker-protection efforts, published 18 Oct 1979 (product-page description and highlights) [gao]
- Locator
- gao.gov/products/hrd-80-2 - Highlights section
- Finding type
- gov_survey
- Finding
- GAO documented that the U.S. Navy used asbestos insulation aboard its ships and that the Navy's policy through the 1970s was to remove and replace only damaged insulation, modified in 1979 to selective replacement in high-maintenance areas - establishing that asbestos insulation was a normal, service-wide material of the era in which this hull was built and operated (1941-1967).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- WWII construction era through 1979
- Population
- Navy shipbuilding and repair workforce, era context
- Limitations
- Program-level document: GAO's fieldwork covered Long Beach and Norfolk Naval Shipyards and Navy-wide policy - it does not name this hull, class, or builder, and does not establish that asbestos was aboard SC-512. Full 26-page report PDF not retrieved this session; product-page description is the cited content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-07
-
[9]Batch-7887 search ledger (this record): NavSource; uboat.net; USCG 'W' Numbers register (Flynn 2014); NARA catalog (muster rolls NAID 192740789, logbook series, 'Air Condor' search); shipbuildinghistory yard register; NHHC DANFS candidate URLs; NVR ship-detail candidate URL; navalmarinearchive WAVR table; secondary web sweep [other_primary]
- Locator
- search_ledger rows sl-uss-sc-512-sc512-01 through sl-uss-sc-512-sc512-10
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or museum/restoration environmental report naming SC-512, PC-512, WAVR-414, Air Condor, or Argo was found in the public sources searched (see search_ledger). CourtListener: the four prescribed base queries completed - 'USS SC-512' and 'SC-512' opinion and docket - returning zero qualifying litigation (19 opinion + 26 docket hits all name collisions; 'SC-512 asbestos' docket variant 0), so the litigation index is a true negative result for the SC-512/USS SC-512 identifiers.
- 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 - era-consistent use of asbestos insulation in Navy vessels of the period is documented at program level (ev-07). Does not establish that asbestos is or is not present; does not establish or defeat any individual exposure claim or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-08
-
[10]Cross-checks across NavSource, uboat.net, shipbuildinghistory (yard page + aggregate table), USCG Flynn 'W' Numbers PDF, NARA catalog, and the batch re-scope note [other_primary]
- Locator
- cited pages as in ev-01 through ev-05; batch prompt re-scope note 2026-09-29
- Finding type
- historical_record
- Finding
- CORRECTIONS/CROSS-CHECKS: (1) Batch re-scope note said 'PC-512 never existed as a PC vessel (PC-461 class numbering skips this block)' - the accurate framing per NavSource is narrower: the hull commissioned as USS PC-512 on 10 July 1942 and carried that designation ~9 months until the April 1943 class-wide reclassification to SC-512; she was never a PC-461-class (173-ft steel) patrol craft, which is the sense in which 'PC-512 never existed as a PC vessel' holds. (2) Builder identity/location conflict: 'American Cruiser Co., Detroit, MI' (NavSource, uboat.net, navypedia, shipbuildinghistory aggregate) vs 'American Cruiser Works, Riverside, MI' (shipbuildinghistory yard register, which admits it can find no information on the company) - unresolved. (3) Class-total figures differ by source (NavSource index '580 built' vs commonly cited ~438 completed of ~475-580 authorized) - not carried as fact here. (4) Sale date: NavSource 'sold 17 January 1948' vs shipbuildinghistory 'sold 1948' - NavSource date carried.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1967; reconciled 2026-10-03
- Limitations
- Each conflict is between secondary sources; no primary instrument (contract, transfer directive, NVR strike entry, or casualty report) was located to resolve them. Items carried in the record fields use the best-supported reading with conflicts repeated in gaps.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-512-sc512-09