Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[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-723-pc723-pkt-930-packet-md
-
[2]Dictionary of American Naval Fighting Ships - 'SC-723' within 'SC-701 - SC-800' (Naval History and Heritage Command, live page) [nhhc_danfs]
- Locator
- DANFS 'SC-701 - SC-800' compiled entry, SC-723 line item
- Finding type
- vessel_history
- Finding
- DANFS entry for SC-723 (in the SC-701 to SC-800 block): 'Built at Harbor Boat Building Co., Terminal Island, Calif. Keel laid 3/6/42. Launched 6/10/42. Commissioned 12/7/42. Transferred to China 6/30/48.' DANFS files and indexes this hull as SC-723 with no narrative entry and no mention of the PC-723 commissioning designation.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Authoritative identity record naming this hull - establishes builder, keel, launch, commissioning, and China transfer dates only. Contains no service narrative, no asbestos or material content, and no mention of the PC-723 designation or the 1948 loss; NavSource's page for this hull states 'no DANFS history currently available,' which is stale - this terse compiled entry exists on the live NHHC site (verified 2026-10-03).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-01
-
[3]NavSource Online: Submarine Chaser Photo Archive - SC-723 (ex-PC-723) page [other_primary]
- Locator
- NavSource 12/150723.htm header timeline, specifications block, and photo captions (3 images)
- Finding type
- vessel_history
- Finding
- NavSource timeline and spec block for this hull (filed as 'SC-723, ex-PC-723' in the 110' Submarine Chaser Photo Archive): laid down 6 March 1942 by Harbor Boat Building Co., Terminal Island, CA; launched 10 June 1942; 'Commissioned USS PC-723, 7 December 1942'; 'Reclassified SC-723'; decommissioned 13 February 1946 at Subic Bay, Philippines; struck from the Naval Register 20 March 1946; transferred to the Republic of China 30 June 1948; 'Sunk by a typhoon 27 August 1948 while being towed from the Philippines to Taiwan by the Yung Ming, ex-Phantom (AM 273).' Specs: 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 880 bhp General Motors 8-268A diesels, Snow and Knobstedt single reduction gear, two shafts. Photo captions document the hull 'somewhere in the Philippines' (Lt Glenn Wiley McMaster), in dry dock with LST-286 at Challenger Cove, Humboldt Bay, New Guinea, c. March 1945, and 'being stripped in the Philippines after decommissioning,' c. 1946.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates track DANFS/NVR conventions but the PC-723-to-SC-723 reclassification is undated and sole-sourced here (the shipbuildinghistory yard table, uboat.net, and DANFS corroborate the surrounding milestones but not the reclassification date). The spec block is class boilerplate shared verbatim with sister SC-497 pages - plausible but not hull-verified. The 1948 typhoon loss under tow by Yung Ming is NavSource sole-sourced; the towing vessel's identity is corroborated by NavSource's Phantom (AM-273) page, which documents her transfer to the Nationalist Chinese Navy 15 June 1948 as Yung Ming. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-02
-
[4]NARA file unit NAID 192211298, 'SC-723, 12/7/42-2/15/46' - RG 24 muster rolls (National Archives Catalog) [other_primary]
- Locator
- NARA catalog record page; file unit title, RG/series placement, Roll 6842, 184 digital objects
- Finding type
- historical_record
- Finding
- NARA holds and has digitized this hull's muster rolls as a single file unit: 'SC-723, 12/7/42-2/15/46' (NAID 192211298; microfilm Roll 6842), in Record Group 24 (Records of the Bureau of Naval Personnel), series 'Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities' (NAID 594996). 184 images are available in the National Archives Catalog (Ancestry partnership scan); access unrestricted. The coverage dates align exactly with the commissioned span - 7 December 1942 (commissioning) to 15 February 1946 (two days after the 13 February 1946 decommissioning at Subic Bay).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Archival resource describing this specific hull: muster rolls record personnel assigned, not materials - the rolls could support a crew-member-level exposure study but contain no asbestos or construction-material information in their catalog description, and individual roll pages were not transcribed this session. Filed under the final SC-723 designation covering the whole span including the PC-723 commissioning period.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-03
-
[5]NARA file units NAID 175667176 ('SC-723') and NAID 175666093 ('PC-723') - RG 19 Microfilm of Ship Engineering Drawings (National Archives Catalog) [other_primary]
- Locator
- NARA catalog record pages (also https://catalog.archives.gov/id/175666093); series NAID 559593; College Park - Cartographic copy details
- Finding type
- historical_record
- Finding
- NARA catalogs Bureau of Ships engineering drawings for this hull under BOTH designations: file unit 'SC-723' (NAID 175667176) and file unit 'PC-723' (NAID 175666093), both in Record Group 19 (Records of the Bureau of Ships), series 'Microfilm of Ship Engineering Drawings' (NAID 559593, compiled 1945-1955), creator listed as the Bureau of Ships Ship Design Division, Preliminary Design Branch. Both are paper/microfilm holdings at the National Archives at College Park - Cartographic; neither is digitized ('Not Yet Available Online').
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Archival lead only: BuShips engineering/plan microfilm is precisely the kind of record that could carry ship-specific material callouts (insulation, lagging schedules), but the drawings are undigitized and their content is unexamined - nothing about asbestos content can be asserted from the catalog description. The existence of file units under both PC-723 and SC-723 independently corroborates the dual-designation history of this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-04
-
[6]NARA Special List #44, index by ship number (archives.gov PDF) [other_primary]
- Locator
- SL-44 ship-number index, SC-723 rows (two runs listed)
- Finding type
- historical_record
- Finding
- NARA Special List #44 (List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947) indexes two deck-log runs for SC-723: 1/1/1943-11/27/1943 and 1/1/1944-6/30/1945. These are the wartime deck logs - a day-level operational record of this hull's movements (including the New Guinea and Philippine service documented in NavSource photographs).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Index-level verification only: SL-44 establishes that two deck-log runs exist for this hull, but the logs themselves are not publicly digitized and their contents are unexamined - no operational detail or material information is asserted from them. Coverage gaps: no run indexed for commissioning month (December 1942) or for 11/28/1943-12/31/1943 between the two listed runs.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-05
-
[7]NavSource 110' Submarine Chaser index + SC-723 page; DANFS SC-701-SC-800 placement; uboat.net ship/8940 class listing; shipbuildinghistory Harbor Boatbuilding table row 152 [other_primary]
- Locator
- NavSource SC index header text and 'SC-723 ex-PC-723' index entry; DANFS SC-701-800 SC-723 line; uboat.net ship 8940; shipbuildinghistory.com harbor.htm row 152
- Finding type
- historical_record
- Finding
- CORRECTION: despite commissioning under the patrol-craft number PC-723, this hull is an SC-497-class 110-foot wood-hulled submarine chaser, NOT a PC-461-class 173-foot steel patrol craft. NavSource files the hull in the 110' Submarine Chaser archive under SC-497 class with wood-hulled class characteristics (its SC index describes 580 SC-497-class wood-hulled 110-foot boats), gives wooden-boat dimensions (110'10" x 17', 148 t.) and diesel machinery inconsistent with the PC-461 type; DANFS indexes it as SC-723 in the SC-701-to-SC-800 block alongside sister Harbor Boat Building hulls; uboat.net and shipbuildinghistory classify it SC-497. The SC index shows several sisters with the same ex-PC pattern (SC-498, SC-503, SC-504, SC-642, SC-643) - a documented designation quirk of this class block, not evidence of a separate steel hull.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Resolves a class-confusion risk: a record indexed under 'PC-723' could be mistaken for a PC-461-class steel patrol craft. The PC-723 designation was real (commissioning designation per NavSource) but the hull type is SC-497 wood-hulled - material profile differs sharply (wooden hull, diesel plant, no boilers/steam). The reclassification date itself is undocumented in located sources.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-06
-
[8]shipbuildinghistory.com Harbor Boatbuilding yard table (row 152); uboat.net Allied Warships ship page 8940 [other_primary]
- Locator
- shipbuildinghistory harbor.htm table row 152; uboat.net/allies/warships/ship/8940.html spec block and history line
- Finding type
- historical_record
- Finding
- Secondary corroboration of construction and loss: shipbuildinghistory.com's Harbor Boatbuilding (Terminal Island) yard table lists this hull as yard no. 152, 'SC 723,' U.S. Navy submarine chaser, 110 ft., delivered/commissioned 7-Dec-42, 'To Taiwan 1948 but lost in typhoon en route.' uboat.net lists USS SC-723 as SC-497 class, built by Harbor Boat Building Co., ordered 14 February 1942, laid down 6 March 1942, launched 10 June 1942, commissioned 7 December 1942, transferred to Taiwan 30 June 1948.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Secondary compilations used as corroboration only - they confirm builder, dates, the Taiwan transfer and the typhoon loss (matching NavSource's account) but are not themselves primary records. uboat.net's 'ordered 14 Feb 1942' is the only located order date. Neither contains asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-07
-
[9]Era inference built on: NavSource spec block (2 x GM 8-268A diesels, no steam plant); NavSource SC index (SC-497 class wood-hulled); GAO HRD-80-2 product-page description (Navy asbestos use to early 1970s) [other_primary]
- Locator
- NavSource 12/150723.htm spec block; NavSource 12/15idx.htm class description; GAO product page HRD-80-2 (full text blocked to automated fetch)
- Finding type
- asbestos_application
- Finding
- Era-level inference: as a wood-hulled, diesel-powered 110-foot submarine chaser built 1942 at a small private yard, this craft's plausible asbestos-relevant scope is confined to machinery fittings - diesel exhaust lagging, gaskets, valve/machinery packing, and electrical insulation - rather than the boiler, steam-line, and turbine lagging typical of steam-driven hulls. GAO documented Navy-wide asbestos insulation use through the early 1970s, a program-level fact spanning this hull's entire service era.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Limitations
- Class/era inference only - no hull-specific insulation schedule, material list, or work package located. Names era-standard applications for a diesel wooden craft, not confirmed installed materials; no quantity. The wood-hulled diesel profile materially narrows plausible scope relative to steam vessels, but does not reduce it to zero.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-08
-
[10]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, gao.gov returns HTTP 403 to automated fetch)
- Finding type
- gov_survey
- Finding
- GAO 'Navy Efforts To Protect Workers From Asbestos Exposure' (HRD-80-2, October 18, 1979) documents 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 construction (1942) and entire U.S. service era (1942-1946).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Limitations
- Program-level documentation only; does not name this hull or this class and does not establish materials aboard. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403) - content via product-page description, consistent with prior batch usage.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-09
-
[11]Batch-8097 search ledger (this record): NHHC DANFS live page; NavSource ship page and SC index; NARA catalog (muster rolls NAID 192211298; BuShips drawings NAIDs 175667176 and 175666093); NARA Special List 44; NVR; CourtListener; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-pc-723-pc723-01 through -16
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or docketed case naming SC-723 or PC-723 was found in the public sources searched (see search_ledger). CourtListener searches returned hits only as name collisions (court docket numbers, 'S.C.' reporter citations) - zero qualifying asbestos litigation under either designation. Secondary web sweeps surfaced no litigation naming this hull and no law-firm listicle claims for this specific hull number - unusually, this hull does not appear in the marketing-generated 'asbestos ship' lists that cover better-known vessels.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. The hull sank in 1948, so no modern survey or abatement record can exist; the highest-value remaining leads are the undigitized BuShips engineering-drawing microfilm (NAIDs 175667176 and 175666093) and the SL-44-indexed deck logs. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-723-pc723-10