Evidence
12 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-12).
-
[1]research packet 930-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-722-pc722-pkt-930-packet-md
-
[2]DANFS (Naval History and Heritage Command), listing 'SC-701 - SC-800', SC-722 entry [nhhc_danfs]
- Locator
- SC-722 entry within the 'SC-701 - SC-800' DANFS listing page
- Finding type
- vessel_history
- Finding
- DANFS documents for this hull: 'Built at Harbor Boat Building Co., Terminal Island, Calif. Keel laid 3/5/42. Launched 5/15/42. Commissioned 11/14/42. Transferred to China 6/30/48.' The entry files the hull in the SC-701-SC-800 block - the official listing treats her as submarine chaser SC-722, establishing U.S. Navy service 1942-1948 and the China transfer.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Harbor Boat Building construction trades (1942); crew (1942-1948)
- Limitations
- The DANFS entry is a bare listing - no narrative, no designation detail (it does not record the initial PC-722 commission designation or the April 1943 reclassification; those come from NavSource/NavalCoverMuseum), no specification block, and no asbestos or material content. NavSource's own page states 'There is no DANFS history available for SC-722' - correct in that no narrative DANFS entry exists; this listing entry is the whole of the DANFS record.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-01
-
[3]NavSource Online: Submarine Chaser Photo Archive, 'SC-722, ex-PC-722' page [other_primary]
- Locator
- NavSource 12/150722.htm header block ('ex-PC-722'), timeline, and specifications block
- Finding type
- vessel_history
- Finding
- NavSource records this hull as SC-497 Class Submarine Chaser: laid down 5 March 1942 by Harbor Boat Building Co., Terminal Island, CA; launched 15 May 1942; commissioned PC-722 on 14 November 1942; reclassified SC-722 in April 1943; transferred to China 30 June 1948; 'Fate unknown.' Call sign Nan-Xray-George-Able. Specifications: displacement 148 t.; length 110' 10"; beam 17'; draft 6' 6"; speed 15.6 kts; complement 28; armament one 40mm mount, two .50 cal. machine guns, two depth-charge 'Y guns,' two depth-charge tracks; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single-reduction gear, two shafts. Header notes 'SC-722 served the Navies of the United States and China.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Construction trades (1942); crew (1942-1948)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - dates track DANFS exactly where DANFS exists, but the PC-722 commission designation, April 1943 reclassification, specification block, and complement 28 rest on NavSource alone; the two .50-cal entries, '148 t' displacement, and 'Complement 28' differ from class-design figures elsewhere (see gaps). No image of the hull is available on the page. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-02
-
[4]NARA, Record Group 24, series 'Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities', file unit 'SC-722, 11/17/42-1/1/46', NAID 192211131 (Roll 6841; 166 images digitized online) [other_primary]
- Locator
- NAID 192211131, Roll 6841; sampled images incl. Report of Changes (May 1943), recapitulation sheet (quarter ending 1944-06-30), Report of Changes (February 1945); NAB-158 identification via https://www.archives.gov/san-francisco/finding-aids/holdings-guide-08.html
- Finding type
- historical_record
- Finding
- The hull's digitized muster rolls (primary personnel records, Bureau of Navigation / Bureau of Naval Personnel) cover 17 November 1942 - 1 January 1946 and are the only ship-specific personnel record located. Sampled pages document: Report of Changes for month ending 21 May 1943 showing the ship sailing 'from San Diego, Calif. to West' (destination truncated on the form); recapitulation sheet for quarter ending 30 June 1944 showing 26 brought forward, 4 gained, 6 lost, 24 remaining aboard vs. operating allowance 25; and a February 1945 Report of Changes showing personnel transfers to/from NAB Navy 158 - the Naval Advance Base at Torokina, Bougainville Island, Solomon Islands (1943-1945 per NARA San Francisco holdings guide) - and to/from minesweepers YMS-197 and YMS-269, placing the ship in the Bougainville/Solomon Islands area in early 1945.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1946
- Population
- Crew of USS PC-722/SC-722, 1942-11-17 through 1946-01-01 (enlisted strength ~24-26 aboard in sampled periods)
- Limitations
- Personnel records only: they establish crew presence, onboard strength, and operating locations - they contain no asbestos, material, or condition information and do not establish exposure. Coverage begins 11/17/42 (three days after commissioning). Findings rest on sample pages from the 166-image unit, not exhaustive transcription; the 'to West' sailing destination is truncated on the form and is not asserted beyond the form's wording.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-03
-
[5]ShipbuildingHistory.com (Tim Colton compilation), 'Harbor Boat Building, Terminal Island CA' yard record table [other_primary]
- Locator
- Harbor Boat Building yard table, hull rows 151-158 (SC 722-729); yard history note
- Finding type
- historical_record
- Finding
- The builder's yard table records this hull as yard hull no. 151: 'SC 722, US Navy, Sub Chaser, 95d [tons], 110 [ft], delivered 14-Nov-42, To Taiwan 1948.' The table also documents the yard context: Harbor Boat Building Company was founded by Romolo Rados in 1919 at Terminal Island and also built Coast Guard patrol boats, YMS minesweepers, BPT torpedo boats, and PT boats during the same wartime period; the SC block SC-722 through SC-729 (yard hulls 151-158) was built consecutively. Sister hull SC-723 (yard no. 152) is recorded 'To Taiwan 1948 but lost in typhoon en route.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Harbor Boat Building construction trades, Terminal Island (1942); concurrent small-craft construction population at the same yard
- Limitations
- A private-sector compiled yard record, not a federal registry - corroborates DANFS dates and adds yard hull number and delivery detail, but the 'To Taiwan 1948' disposition and the SC-723 typhoon note are compilation data not separately verified against primary transfer records. '95d' tons is a deadweight/design figure differing from NavSource's 148 t (see gaps). Contains no asbestos content; the yard's wartime small-craft workload is context for the construction population, not an exposure finding.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-04
-
[6]NavalCoverMuseum (naval-cover archive wiki), 'SC 722' ship page - designation history and cover holdings [museum_official]
- Locator
- NavalCoverMuseum 'SC 722' page, 'Ship Name and Designation History' table
- Finding type
- historical_record
- Finding
- CORRECTION / designation sequence: NavalCoverMuseum's chronological designation history records the hull as SC-497 Class Submarine Chaser; laid down 5 March 1942, launched 15 May 1942; commissioned as USS PC-722 on 14 November 1942; redesignated USS SC-722 in April 1943; decommissioned (date unknown); transferred to China 30 June 1948; fate unknown. This corrects the batch-source framing of the vessel as a 'USS PC-722 (PC-461-class patrol craft)' - the hull was always an SC-497-class 110-foot wooden submarine chaser; the initial PC hull designation was a numbering assignment corrected to the SC series in April 1943, and the vessel was never a PC-461-class 173-foot patrol craft. The museum also holds a c.1943 naval cover associated with SC-722.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Limitations
- NavalCoverMuseum is a volunteer-compiled philatelic archive, not an official registry - corroborates NavSource's designation sequence but does not independently document it; the reclassification 'April 1943' lacks a day-level date or BuShips directive citation in located sources. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-05
-
[7]uboat.net Allied Warships of WWII database, 'USS SC-722 (SC-722)' entry [other_primary]
- Locator
- uboat.net ship entry 8939 - data block and history line
- Finding type
- vessel_history
- Finding
- The Allied Warships database records this hull as a submarine chaser of the SC-497 class: built by Harbor Boat Building Co. (Terminal Island, California); ordered 14 February 1942; laid down 5 March 1942; launched 15 May 1942; commissioned 14 November 1942; history line 'Transferred to Taiwan on 30 June 1948.' The order date of 14 February 1942 is the only contract-date datum located for this hull.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Limitations
- Secondary compiled database (Guomundur Helgason's Allied Warships) - dates match DANFS/NavSource exactly where they overlap; 'ordered 14 February 1942' and the 'Transferred to Taiwan' wording are compilation data not verified against contract or transfer records. 'Taiwan' versus DANFS's 'China' reflects post-1949 retrospective usage; the 1948 recipient was the Republic of China. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-06
-
[8]Era inference built on: NavSource specification block (two GM 8-268A diesels, two shafts, wooden SC-497-class 110-ft hull); NavSource SC index (580 SC-497-class built, 142 lend-lease); Wikipedia class article (438 for USN 1941-44; GM 16-184A or 8-268A diesels; wooden hull); GAO HRD-80-2 Navy-wide asbestos-use documentation (see ev-08) [other_primary]
- Locator
- NavSource 12/150722.htm specifications; NavSource 12/15idx.htm SC-497 index; Wikipedia SC-497-class article data block
- Finding type
- asbestos_application
- Finding
- A wooden-hulled 110-foot submarine chaser built in 1942 sits inside the Navy's documented asbestos-use era, but its machinery fit bounds the plausible material list: with a diesel plant (two GM 8-268A engines) and no steam system, era-standard applications aboard a chaser of this type were diesel exhaust/muffler lagging, engine gaskets and packing, and electrical insulation - a materially smaller asbestos footprint than steam combatants. The boiler, steam-drum, steam-line, and turbine-lagging pathways do not exist aboard this hull.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Harbor Boat Building construction trades (1942); engine-room crew (1942-1948); any maintenance personnel at wartime bases
- Limitations
- Class/era inference only - no hull-specific material list, insulation survey, or work package located for SC-722. Names era-standard applications for the type, not confirmed installed materials. No quantity. Product names are normalized era terms; no manufacturer attribution for this hull. Wooden hull construction does not imply asbestos-free - exhaust-system lagging and engine-room gasketing remained era-typical applications.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-07
-
[9]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, verified 2026-10-03)
- 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 (1942) and U.S. Navy service era (1942-1948).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1979 (report); exposure era covers 1942-1948
- Population
- Navy shipyard workers and shipboard personnel, era-wide
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved - gao.gov returned HTTP 403 to automated fetches on 2026-10-03 (confirmed this session); content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-08
-
[10]NARA catalog full-text search results under query 'SC-722': COMWESTSEAFRON war-diary file units (e.g., 'COMWESTSEAFRON - War Diary, 2/1-28/43', NAID 134172198, RG 38 WWII War Diaries series, 745 images) and the 'DES BASE, SAN DIEGO - War Diary, 12/1-31/42' file unit (NAID 134031745) [other_primary]
- Locator
- catalog.archives.gov search results, query '"SC-722"', file units NAID 134172198 and 134031745
- Finding type
- historical_record
- Finding
- The NARA catalog's full-text search surfaces Commander Western Sea Frontier war-diary file units and a Destroyer Base San Diego war-diary unit under the query 'SC-722' - consistent with a newly commissioned West Coast chaser operating under WESTSEAFRON in early 1943. If the hull is named in these diaries, they are an operational-context record of her first service months out of San Diego.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1943
- Limitations
- Archival lead only - the catalog's match mechanism is OCR/full-text indexing, and whether 'SC-722' is actually named at page level in these 745-image units is unverified (no pinpoint page located; matches could also arise from tokenized 'SC' + '722' in adjacent contexts). Not verified as a hull mention; no asbestos content regardless.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-09
-
[11]KLCC (NPR member station), '80 years after commission, a sub chaser sinks into history' (2022-07-05) [reputable_press]
- Locator
- KLCC article body text (SC-772 sinking, Longview WA, June 2022; NOAA incident link 10486)
- Finding type
- historical_record
- Finding
- CORRECTION / name-collision guard: KLCC's 2022 report concerns subchaser SC-772, which sank at her pier at Longview, Washington on 28 June 2022 during restoration - but the article's body text in one sentence calls the hull 'SC-722' ('SC-722 had reportedly been carrying 500 gallons of vegetable oil'). The Longview wreck is SC-772, a different SC-497-class hull. SC-722 was transferred to the Republic of China on 30 June 1948 and is not the Longview vessel.
- Verification
- verified
- Role
- correction
- Documentation level
- context_only
- Accessed
- 2026-10-03
- Study period
- 2022
- Limitations
- Corrects a documented press-level designation slip, not a material claim. The article itself is about SC-772 throughout; the single 'SC-722' wording is the error. Does not affect this hull's documented disposition. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-10
-
[12]Batch-8096 search ledger (this record): NHHC DANFS listing; NavSource SC-722 page and SC index; NARA catalog (muster rolls verified; deck-log series and war-diary leads); shipbuildinghistory.com yard table; NavalCoverMuseum; uboat.net; NVR; GAO; secondary web litigation sweep; CourtListener (see ledger rows for status) [other_primary]
- Locator
- search_ledger rows sl-uss-pc-722-pc722-01 through -14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or litigation naming USS PC-722/SC-722 was found in the public sources searched (see search_ledger). All eight CourtListener queries completed (4 base + 4 asbestos-qualified variants, opinion and docket for both designations): every returned page consists of citation-format name collisions ('S.C. 722' reporter cites, 'P.C.' corporate names, '(PC)' docket markers) with zero vessel-naming hits in any returned page. Secondary web sweeps surfaced no 'asbestos aboard' claims naming this hull at all - only generic list-level marketing content about Navy ships that does not name SC-722 and is excluded by source policy. Deck logs were not located in NARA's digitized Logbooks series; an earlier triage note's cited deck-log ranges (11/14/1942-4/30/1943; 1/1/1944-) could not be re-verified in the current catalog.
- 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 remains reasonable but is not ship-proven. Does not establish or defeat any claim of exposure or legal eligibility. Litigation caveat: collision-dominated result sets mean a vessel-naming case buried below the top-20 of a large count could be missed; however the asbestos-filtered variants also returned zero vessel hits in their returned pages.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-722-pc722-11