Evidence
6 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-6).
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[1]research packet 1101-packet.md (2 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED (with thin per-hull dating
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERIFIED (with thin per-hull dating
- Evidence ID
- uss-pc-811-pc811-pkt-1101-packet-md
-
[2]NavSource Online: Submarine Chaser Photo Archive, PC-811 (navsource.net; navsource.org mirror is dead per standing citation-hygiene rule - navsource.net verified live 2026-10-03) [other_primary]
- Locator
- navsource.net archives/12/010811.htm, full page text (specifications block, disposition line, photo caption)
- Finding type
- vessel_history
- Finding
- NavSource vessel-history page for this hull (full page text extracted and verified live): call sign Nan-William-Queen-Zebra; PC-461-class submarine chaser laid down 6 November 1943 by the Commercial Iron Works, Portland, Oregon; launched 18 December 1943; commissioned USS PC-811, 17 April 1945; struck from the Naval Register 12 April 1946; transferred to the War Shipping Administration in March 1948; transferred to Portugal in 1948 and named Madeira (P 582); fate unknown. Specifications: displacement 280 t (light), 450 t (full load); length 173'8"; beam 23'; draft 10'10"; speed 19 kts; complement 65; armament one 3"/50 dual-purpose gun mount, one 40mm gun mount, three 20mm guns, two rocket launchers, four depth-charge projectors, two depth-charge tracks; propulsion two 2,560 bhp Hooven-Owen-Rentschler RB-99DA diesel engines, Westinghouse single reduction gear, two shafts. The page states verbatim: 'There is no DANFS history available for PC-811.' One photograph (c. 1966, credited to Robert Hurst) is the only image on the page; its caption does not state whether it depicts the hull under U.S. or Portuguese colors.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1948 (construction through transfer); c. 1966 (sole photograph)
- Limitations
- Vessel-history and specifications source only - documents construction, service milestones, and disposition, not asbestos content or materials aboard. NavSource's own page confirms no DANFS entry exists for this hull (independently corroborated - see ev-uss-pc-811-pc811-03). Its 'fate unknown' notation and 'War Shipping Administration' transfer label are carried as-is; the WSA label is flagged as an open dating/attribution question, not resolved here (see ev-uss-pc-811-pc811-05 and gaps).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-811-pc811-01
-
[3]uboat.net Allied Warships, USS PC-811 (ship ID 8638) [other_primary]
- Locator
- uboat.net ship detail page 8638, 'Commands' and specification sections
- Finding type
- vessel_history
- Finding
- Cross-check record: PC-461-class patrol craft; builder Commercial Iron Works, Portland, Oregon; ordered 27 February 1942; laid down 6 November 1943; launched 18 December 1943; commissioned 17 April 1945; commanding officer Lt. Robert M. Steptoe, USNR, from commissioning through late 1945 (the page notes its own commands list is incomplete). Confirms NavSource's construction and commissioning dates; the page records no information on the vessel's operational career, the Portugal transfer, or its ultimate fate.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1945
- Population
- Commanding officer and crew, April-December 1945 (incomplete command list per source)
- Limitations
- Third-party warship database (not an official DANFS/NHHC/NARA/NPS/NVR source) used only to cross-check construction dates and surface the sole named commanding officer; carried as context, not an independent primary finding. No asbestos content. Silent on the Portugal transfer - neither corroborates nor contradicts it.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-811-pc811-02
-
[4]Batch-9607 search ledger (this record): live NHHC DANFS URL probe; ibiblio DANFS/PC mirror; NHHC photography site search; Naval Vessel Register quickfind; NARA catalog web sweep; CourtListener (blocked, see search_ledger) [other_primary]
- Locator
- search_ledger rows sl-uss-pc-811-pc811-01, -04, -05, -06
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located for PC-811/Madeira: no survey, abatement contract, hazmat disclosure, or docketed/opinion case naming this hull was found in the public sources searched (see search_ledger). No DANFS entry of any kind exists for this hull: confirmed by a direct 404 on the live NHHC DANFS URL pattern, a 404 on the ibiblio DANFS/PC mirror (whose neighboring PC-810 page exists and does not reference PC-811), and NavSource's own 'There is no DANFS history available for PC-811' notation. No Naval Vessel Register record exists either: a live NVR quickfind search for 'PC-811' (nvr.navy.mil, 2026-10-03) returned the header 'Hulls Matching Search Text: PC-811' with an empty results table - zero matching hulls.
- 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 - a 1943-45 diesel patrol craft built at a small wartime yard is consistent with retained era materials. Does not establish that asbestos is or is not present aboard this hull, and does not establish or defeat any claim of exposure or legal eligibility. The CourtListener litigation search is incomplete (blocked by a fleet-wide pacing throttle on all 4 attempts this session), not negative - see gaps.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-811-pc811-03
-
[5]NavSource specifications block (ev-uss-pc-811-pc811-01) + Atlas shipyards.json dataset cross-check (builder not present) [other_primary]
- Locator
- NavSource specifications block (ev-01); Atlas shipyards.json, 37 entries reviewed, no Commercial Iron Works / Portland-OR small-yard match
- Finding type
- asbestos_application
- Finding
- Era/class inference: a PC-461-class diesel submarine chaser built 1943-45 at a small private wartime yard would carry period-standard asbestos-containing materials in its engine spaces and berthing/galley compartments - engine and exhaust lagging, gaskets, valve packing, and electrical insulation - consistent with era shipbuilding practice across the wartime fleet. The class's diesel propulsion (two reciprocating diesel engines, no boiler/turbine plant) means no boiler-lagging pathway applies. Builder Commercial Iron Works (Portland, OR) is NOT present in the Atlas shipyards.json dataset (all 37 yard_id entries checked, 2026-10-03) - no yard-level tier context is available for this specific builder.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1943-1945
- Limitations
- Class/era inference only - no ship-specific asbestos finding is made from this row; it adds context, not an independent finding for this hull. No yard-level industrial-hygiene study was located for Commercial Iron Works specifically. This builder must not be conflated with the much larger Kaiser-operated Oregon Shipbuilding/Swan Island/Vancouver yards in the same metro area, which have separate, unrelated asbestos documentation that does not apply to Commercial Iron Works or this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-811-pc811-04
-
[6]60 Stat. 501 (Act of July 8, 1946, ch. 543, title II, sec. 202) terminating the War Shipping Administration effective 1 September 1946 (govinfo.gov, 50 U.S.C. 4704-4705 notes); 63 Stat. 714, Mutual Defense Assistance Act of 1949, approved 6 October 1949 (govinfo.gov); cross-referenced against NavSource disposition lines for sister PC-461 hulls PC-812 (to Portugal as Flores/Principe) and PC-1256 (to Portugal as Sao Tome) [other_primary]
- Locator
- govinfo.gov 50 U.S.C. 4704-4705 notes (WSA termination); govinfo.gov 63 Stat. 714 (MDAA approval date); NavSource disposition lines, archives/12/010811.htm, /010812.htm
- Finding type
- vessel_history
- Finding
- This batch's assignment brief characterizes the 1948 Portugal transfer as 'MDAP' (Mutual Defense Assistance Program). That label is not supported by any source reviewed this session: NavSource states only a March 1948 transfer to the 'War Shipping Administration' followed by transfer to Portugal in 1948, naming no assistance program. The Mutual Defense Assistance Act was not approved until 6 October 1949 - after this transfer - and the War Shipping Administration itself was terminated effective 1 September 1946 (60 Stat. 501), so a literal WSA custodian in March 1948 is itself unverified and likely a legacy/boilerplate label rather than the actual disposal authority (probably the Maritime Commission's National Defense Reserve Fleet disposal process under the 1946 Ship Sales Act framework). At least two sister PC-461 hulls transferred to Portugal in the same window carry the identical 'WSA, March 1948' disposal phrasing on NavSource, indicating a standardized record phrase for this class rather than an error specific to PC-811 - but the underlying legal mechanism, and any 'MDAP' characterization, remain unverified.
- Verification
- disputed
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1946-1949
- Limitations
- This is a correction to the batch brief's framing, not to a cited primary source - no State Department foreign-assistance record, Federal Register notice, or NDRF/Maritime Commission transfer order was located to confirm either 'MDAP' or a literal WSA custodian in March 1948. Carried as an open dating/attribution question in gaps; the Portugal transfer and Madeira renaming themselves are not in doubt (corroborated by NavSource and the class-wide disposal pattern).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-811-pc811-05