Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[1]research packet 940-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-794-pc794-pkt-940-packet-md
-
[2]NavSource Online: Submarine Chaser Photo Archive, PC-794 - build timeline, specifications, transfer record (verified live 2026-10-03) [other_primary]
- Locator
- NavSource 12/010794.htm header block and specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull (PC-461 class submarine chaser): laid down 24 April 1943 at Commercial Iron Works, Portland, OR; launched 29 May 1943; commissioned USS PC-794 on 25 May 1944; struck from the Naval Register 13 December 1946; transferred to the War Shipping Administration in June 1948; transferred to Mexico in 1948 and reclassified GC-34; fate unknown. Call sign Nan-Yoke-Able-Yoke. 'PC-794 served the Navies of the United States and Mexico.' Specifications: displacement 450 t.; length 173'8"; beam 23'; draft 10'10"; speed 20.2 kts.; complement 65; armament one 3"/50 dual-purpose mount, one 40mm mount, five 20mm guns, two rocket launchers, two depth charge tracks; propulsion two 1,440 bhp Hooven-Owen-Rentschler R-99DA diesel engines, Westinghouse single reduction gear, two shafts. Page states: 'There is no DANFS History currently available for PC-794.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1964
- Population
- Commercial Iron Works construction trades (1943-44); crew (1944-46); Mexican Navy crew (1948-64)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates generally track Naval Register data but are not independently sourced on the page. Contains no asbestos content. 'Transferred to the War Shipping Administration in June 1948' is the page's disposition label; the WSA had been abolished in 1946 - the actual receiving custodian was the U.S. Maritime Commission (see gaps). No photograph of this hull is held on the page.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-01
-
[3]DANFS, YP-151 (Cressman) - mentions PC-794 escorting YP-151 to Kodiak, December 1945 (verified live 2026-10-03) [nhhc_danfs]
- Locator
- DANFS YP-151 entry, Alaskan Sea Frontier service narrative (final paragraph)
- Finding type
- vessel_history
- Finding
- Official Navy history names this hull on Alaskan duty at war's end: 'Escorted by the submarine chasers PC-794 and PC-818, YP-151 reached Kodiak on 4 December 1945, where her officer-in-charge reported her unseaworthy.' YP-151 had been assigned to the Alaskan Sea Frontier since 19 September 1944 and was routed to Seattle for disposal; the PC-794/PC-818 escort to Kodiak was a leg of that southbound movement.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945
- Population
- PC-794 crew on Alaskan escort duty (1945)
- Limitations
- A mention inside another vessel's DANFS entry - documents PC-794's operational presence and escort employment at Kodiak, Alaska in December 1945, not a history of PC-794 itself. No asbestos or material content. No DANFS entry exists for PC-794 (verified 404 on both NHHC URL patterns, 2026-10-03).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-02
-
[4]Robert J. Cressman, The Official Chronology of the U.S. Navy in World War II (Naval Historical Center), Chapter VII: 1945 - 17 June entry (verbatim transcription at HyperWar/ibiblio, verified live 2026-10-03) [other_primary]
- Locator
- USN-Chron-1945.html, Chapter VII, 17 June entry
- Finding type
- vessel_history
- Finding
- The official U.S. Navy chronology records this hull's only documented wartime casualty: 'Submarine chaser PC-794 is damaged when she strikes an uncharted rock off Theodore Point, Otter Island Alaska, 52 deg 45'10"N, 172 deg 53'20"E' - dated 17 June 1945. The stated coordinates fall in the Attu Island vicinity, Near Islands, Aleutians; GNIS and USCG LORAN-station histories place Theodore Point on Attu. The hull survived the casualty - she was in service escorting YP-151 to Kodiak by 4 December 1945.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945
- Population
- PC-794 crew aboard at the grounding (1945); any subsequent repair-yard trades
- Limitations
- Documents the casualty event (date, place, 'damaged' - not sunk), not the repair: where she was repaired, the scope of hull work, and any yard period are not stated and are undocumented (see gaps). The chronology says 'Otter Island Alaska' but the only named Otter Island is in the Pribilof Islands (St. Paul group, ~57 deg N 170 deg W) - inconsistent with the stated coordinates, which fall in the Attu vicinity where GNIS confirms Theodore Point; BOEM and Nauticapedia both read the location as Attu Island (see gaps). No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-03
-
[5]U.S. Bureau of Ocean Energy Management (BOEM), Shipwrecks of the Alaskan Shelf and Shore (2011), Alaska Region shipwreck/casualty database - PC-794 entry (PDF retrieved 2026-10-03) [other_primary]
- Locator
- BOEM 2011 Shipwreck.pdf, p. ~313 of 610, PC-794 table row
- Finding type
- historical_record
- Finding
- Federal vessel-casualty database entry for this hull: 'PC-794 - Sub chaser 174'/375 - 6/17/1945 - 1943 - Off Theodore Point, Attu Island. The submarine chaser PC-794 was damaged when she hit an uncharted rock off Theodore Point, Attu Island.' Sources cited: NavChron (the Cressman Navy chronology) and the NavSource PC-794 page. Confirms the casualty and independently resolves the location to Theodore Point, Attu Island; lists the hull as built 1943, 174 ft / 375 tons.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945
- Population
- PC-794 crew aboard at the grounding (1945)
- Limitations
- Derivative, not independent: BOEM's own source line is the same Navy chronology plus NavSource, so this row corroborates the event's federal-record standing but is not a second primary witness. The hull is cataloged in a shipwreck database because the casualty occurred on the Alaska shelf - she was damaged, not lost; she returned to service (see ev-02). No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-04
-
[6]ShipbuildingHistory.com (Tim Colton), Commercial Iron Works, Portland OR - yard hull table and yard history (verified live 2026-10-03) [other_primary]
- Locator
- shipbuildinghistory.com Commercial Iron Works table, hull no. 67 row; yard-history header paragraph
- Finding type
- vessel_history
- Finding
- Builder's-yard record for this hull: Commercial Iron Works yard hull no. 67, 'PC 794', US Navy Sub Chaser, 463 LDT, 173 ft, delivered 25-May-44, disposition 'To Mexico 1948 as GC 34.' Yard history on the same page: Commercial Iron Works was started in November 1916 by William T. Casey, Otto J. Hoak and Robert Boogs on a 30-acre site just south of the Ross Island Bridge, Portland; it closed in 1946 after building 188 boats during WWII, and the site was sold to Zidell Marine as a ship-dismantling facility. The delivery date (25-May-44) matches NavSource's commissioning date.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1916-1946 (yard); 1943-44 (this hull)
- Population
- Commercial Iron Works construction trades (1943-44)
- Limitations
- Specialist secondary compilation (author-solicited yard table), consistent with NavSource on every overlapping field - not a primary contract or BuShips record. No asbestos content. The yard's post-1946 fate as the Zidell dismantling site is site-level history, not evidence about this hull's materials.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-05
-
[7]naval-encyclopedia.com, Mexican Navy order-of-battle (ex-US PC type submarine chasers list); corroborated by Nauticapedia vessel entry id=99984 (BC heritage vessel database) [other_primary]
- Locator
- naval-encyclopedia.com mexican-navy.php, 'Ex-US PC type submarine chasers' paragraph; nauticapedia.ca vessel.php?id=99984
- Finding type
- vessel_history
- Finding
- Secondary sources carry the Mexican career and disposal: naval-encyclopedia's ex-US PC list reads 'CG 34 (ex-PC 794, discarded 1964)' among nine transferred PCs 'purchased 1947'; Nauticapedia's vessel profile records PC-794 built 1944 by Commercial Iron Works, Portland OR, the 17 June 1945 grounding at Theodore Point on Attu Island, owned by the U.S. Navy 1944-1948, and 'In 1948 she was transferred to the Republic of Mexico Navy.' NavSource's parallel record: transferred to Mexico 1948, reclassified GC-34, fate unknown.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1948-1964
- Population
- Mexican Navy crew (1948-64)
- Limitations
- Secondary sourcing only - no Mexican Navy register, sale contract, or MARAD disposal card located for the transfer or the 1964 discard. 'Purchased 1947' vs NavSource's 'transferred... June 1948' is unresolved (see gaps). Nauticapedia's profile itself derives the grounding from the same Navy chronology. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-06
-
[8]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire construction (1943-44) and U.S. service era (1944-46), and consistent with continued era materials aboard under Mexican service (1948-64) unless replaced.
- 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. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, confirmed 2026-10-03) - content via product-page description, same standing defect as prior batches.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-07
-
[9]Era inference built on: NavSource specifications (steel hull, 2 x Hooven-Owen-Rentschler R-99DA diesels, Westinghouse reduction gear, 2 shafts); shipbuildinghistory yard record (built 1943-44, Commercial Iron Works); GAO HRD-80-2 asbestos-era window (see ev-07) [other_primary]
- Locator
- NavSource specifications block; shipbuildinghistory CIW record; GAO HRD-80-2 era window
- Finding type
- asbestos_application
- Finding
- A steel-hulled diesel submarine chaser built 1943-44 sits inside the Navy's documented asbestos era. Era-standard asbestos applications aboard a diesel patrol craft of this type and period were engine and muffler-exhaust lagging, machinery insulation, gaskets, valve packing, electrical insulation, fire-resistant joiner/bulkhead materials, and winch/windlass brake linings. As a diesel vessel she carried no boilers or steam system - the boiler/turbine lagging pathway of steam vessels does not apply, and the asbestos footprint is correspondingly smaller than on steam-driven combatants of the era.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1943-1964
- Population
- Commercial Iron Works construction trades (1943-44); crew (1944-46); undocumented repair trades after the June 1945 grounding; Mexican Navy crew (1948-64)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, overhaul record, or litigation product identification located for PC-794. Names era-standard applications, not confirmed installed materials. No quantity and no manufacturer attribution for this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-08
-
[10]U.S. Navy Radio Call Sign Book (WWII), Section 18 (HyperWar/ibiblio transcription, verified live 2026-10-03) [other_primary]
- Locator
- CallSigns-18.html, PC-series call-sign list ('PC794, NYAY')
- Finding type
- historical_record
- Finding
- An official U.S. Navy reference document names this hull: the wartime Radio Call Sign Book lists 'PC794, NYAY' - confirming the voice call sign Nan-Yoke-Able-Yoke carried by NavSource and corroborating this hull's commissioned wartime existence in a primary Navy publication.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1944-1945 (wartime call-sign assignment)
- Limitations
- Confirms the hull's assigned call sign only - an identity corroboration, not a service or materials record. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-09
-
[11]Batch-8167 search ledger (this record): NHHC DANFS (no PC-794 entry exists); DANFS YP-151 entry; official USN WWII chronology (HyperWar); USN Radio Call Sign Book (HyperWar); BOEM Alaska wreck database; NavSource; shipbuildinghistory Commercial Iron Works table; naval-encyclopedia/Nauticapedia Mexican-service secondaries; NVR (out of coverage); MARAD PMARS (dead); NARA catalog (JS-blocked); CourtListener (see ledger for status) [other_primary]
- Locator
- search_ledger rows sl-uss-pc-794-pc794-01 through -15
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, insulation material list, abatement contract, hazmat disclosure, or museum collection record exists for this hull - it is not preserved, and no deck logs, repair records, or work packages were located in digitized public sources. The CourtListener litigation sweep ran all four base queries (2026-10-03): exact-name opinion and docket counts were 0; hull-number queries returned only name collisions, so no litigation of any kind naming this hull was located. Secondary web sweeps surfaced no qualifying asbestos case naming PC-794; the only 'asbestos aboard PC-794' material on the open web is law-firm/marketing listicle content asserting asbestos without primary sourcing - excluded by source policy.
- 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 inference is consistent with asbestos presence but unproven for this hull. NARA RG 24 deck logs and any MARAD disposal card remain undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-794-pc794-10