Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
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[1]research packet 902-packet.md (2 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: PHANTOM
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Evidence ID
- uss-sc-528-sc528-pkt-902-packet-md
-
[2]NHHC DANFS, SC-501 - SC-600 compilation, SC-528 entry (verbatim: 'Built at Mathis Yacht Building Co., Camden, N.J. Keel laid 10/24/41. Launched 2/17/42. Commissioned 6/13/42. Transferred to the Foreign Liquidation Commission 2/26/47.') [nhhc_danfs]
- Locator
- DANFS SC-501 - SC-600 page, SC-528 entry
- Finding type
- vessel_history
- Finding
- Documented for this hull: built at Mathis Yacht Building Co., Camden, NJ; keel laid 24 October 1941; launched 17 February 1942; commissioned 13 June 1942 as SC-528 (SC designation throughout - no PC designation appears anywhere in the DANFS SC-501 through SC-600 compilation, including all eight Mathis-built boats SC-507, SC-508, and SC-524 through SC-529); transferred to the Foreign Liquidation Commission 26 February 1947.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1947
- Population
- Mathis construction trades (1941-42); crew (1942-46)
- Limitations
- Terse DANFS compilation entry - construction and disposition milestones only, no service narrative, no specifications, no asbestos or material content. Does not give decommissioning or striking dates.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-01
-
[3]U.S. Coast Guard, 'The Coast Guard at War,' Vol. V: Transports and Escorts, Volume 1 - Escorts (Historical Section, Public Information Division, USCG Headquarters, 1 March 1949), pp. 11, 171-172 (HyperWar/ibiblio transcription) [other_primary]
- Locator
- USCG V1-Escorts: commissioning table p. 11; SC-528 narrative pp. 171-172
- Finding type
- vessel_history
- Finding
- Official USCG service history for this hull: the Coast Guard manned ten Navy submarine chasers (6 SC and 4 PC); its commissioning table lists 'SC-528 6-13-42' - SC designation from commissioning. 'On July 28, 1942, the Navy crew on the SC-528, which had been transferred from the Eastern Sea Frontier to Greenland Patrol, was relieved by a Coast Guard crew.' Greenland Patrol service documented in detail: departed Boston 30 July 1942 for Casco Bay, thence departing with SC-527 and Tahoma (WPG-80) escorting four trawlers for Sydney; 5 August 1942 departed Sydney for Greenland (convoy SG-4); guardship duties at Kungnat Bay entrance (Bluie West Seven), Arsuk Fjord, and Brede/Skov Fjords junction; 21 October 1942 assisted disabled freighter Margaret Lykes; 1 January - 20 May 1943 patrol/guardship at Arsuk Fjord; Boston availability 1 June - 14 July 1943; convoy SG-29 escort St. John's to Kungnat Bay August 1943; Greenland patrol through end of 1943; 11 January 1944 propeller damaged by two-foot ice; February 1944 transport duty Navy 26 to BW No. 7; departed Greenland 25 July 1944 with Comanche (WPG-76), SC-527, SC-704; detached Task Group 24.8 on 6 August 1944, assigned Commander Service Force Atlantic Fleet; Chelsea Navy Yard availability to 27 August; Charleston minor repairs 30 August 1944. The history states '(No further record of the SC-528 in World War II is available).' Decommissioning entry: 'She was decommissioned March 7, 1946, and her Coast Guard crew removed.' Her Greenland Patrol assignment is corroborated by the Wikipedia Greenland Patrol vessel table (secondary - lists SC 527, SC 528, SC 688, SC 689, SC 704, SC 705).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1946
- Population
- USCG crew of SC-528 (July 1942 - 1946); Greenland Patrol operational community
- Limitations
- Official 1949 USCG institutional history compiled from Coast Guard records - a primary government source, but the compilers themselves noted no further record after August 1944; Pacific-transit and disposal details come from other rows. Its March 7, 1946 decommissioning date conflicts with NavSource's 9 January 1946 (see gaps). No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-02
-
[4]NavSource Online: Submarine Chaser Photo Archive, SC-528 (ex-PC-528) - designation timeline, specifications, history addendum, Pacific transit, commanding officers, USCG photograph [other_primary]
- Locator
- NavSource 12/150528.htm header block, specifications block, history addendum, commanding officers list
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 24 October 1941 by Mathis Yacht Building Co., Camden, NJ; launched 17 February 1942; decommissioned 9 January 1946 at Subic Bay, Philippines (history addendum: 'reported decommissioned and her Coast Guard crew removed'); struck from the Naval Register 25 February 1946; transferred to the State Department Foreign Liquidation Commission 26 February 1947; fate unknown. 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 projector 'Y Guns,' two depth charge tracks; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. Call sign Nan-Able-Sugar-Peter. History addendum documents post-August-1944 Pacific transit under 7th Fleet: Miami 31 August 1944; departed for Canal Zone 17 December 1944; San Diego 18 January 1945; Pearl Harbor 6 February 1945; Eniwetok 8 March 1945; Leyte 25 April 1945; Manila 27 June 1945; Subic Bay 12 August 1945; Aparri P.I. 2 September 1945; Subic Bay 25 November 1945. Commanding officers (incomplete): LTJG Rudolph R. Empire (14-26 Aug 1944); ENS Harold Meyer (from 26 Aug 1944). One USCG photograph archived. Page explicitly notes 'There is no DANFS history available for SC-528' - stale relative to the live NHHC SC-501 - SC-600 compilation entry (see ev-01).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1947
- Population
- USCG crew (1942-46); Mathis construction trades (1941-42)
- Limitations
- NavSource is a volunteer secondary compilation; its milestone dates generally track NVR/official sources (sister page SC-527 cites Naval Vessel Register of 1 January 1949) but its header designation line ('Commissioned PC-528, 12 June 1942; Reclassified SC-528 in April 1943') conflicts with DANFS and the USCG history - see ev-07. The Pacific-transit details (Aug 1944 - Nov 1945) rest on NavSource's addendum alone; the 1949 USCG history expressly had no further record. No asbestos content. 'Fate unknown' vs builder yard table 'sold in the Philippines 1948' - see gaps.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-03
-
[5]Shipbuilding History (T. Colton), 'Mathis Yacht Building Co. / Trumpy - Camden and Gloucester City NJ' yard table and yard history [other_primary]
- Locator
- shipbuildinghistory.com trumpynj.htm, 'Built in Camden by Mathis Yacht Building' table, yard no. 255 row
- Finding type
- vessel_history
- Finding
- Builder yard documentation for this hull: Mathis yard hull no. 255, listed as 'SC 528,' U.S. Navy Sub Chaser, 148 tons, 110 feet, dated 12-Jun-42 (delivery date - consistent with delivery the day before the 13 June DANFS commissioning), disposition 'Sold in the Philippines 1948.' Yard history: Mathis Yacht Building Company was a spin-off of John H. Mathis Company at Cooper's Point, Camden; when WWII came the operation moved to Gloucester City, was acquired by John Trumpy and renamed John Trumpy & Sons, relocating to Annapolis MD after the war. The table lists this hull and all sisters only under SC designations - no PC prefix appears in the yard build record.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1948
- Population
- Mathis construction trades (1941-42); eventual Philippine purchaser/crew (1948+)
- Limitations
- Specialist secondary compilation (Colton's shipbuilding-history tables, built from yard and registry records); the 'Sold in the Philippines 1948' disposition is unverified against a primary source and conflicts with NavSource's 'fate unknown' - carried as a reported disposition, not confirmed. The 12-Jun-42 column entry is the delivery date, which secondary sources have conflated with the commissioning date (see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-04
-
[6]uboat.net Allied Warships of WWII, USS SC-528 (SC-528) warship entry and SC-497 class page (G. Helgason) [other_primary]
- Locator
- uboat.net warship entry 8831 (SC-528); class page 464 (SC-497 class)
- Finding type
- vessel_history
- Finding
- Corroborating warship-register entry for this hull: USS SC-528, submarine chaser, SC-497 class, built by Mathis Yacht Building Co. (Camden, NJ); ordered 1 April 1941; laid down 24 October 1941; launched 17 February 1942; commissioned 12 June 1942 (delivery-date variant - see gaps); 'Manned by the USCG from 28 July 1942'; commanding officer Frank D. Andruss, USNR, 12 June - 28 July 1942 (the Navy commissioning crew relieved by the Coast Guard crew on that date, consistent with the USCG history). Class page: SC-497 class of 443 ships, diesel engines on two shafts, wooden 110-foot hulls.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1946
- Population
- Frank D. Andruss USNR and Navy commissioning crew (June-July 1942); USCG crew (July 1942 - 1946)
- Limitations
- Specialist secondary register; its 12 June 1942 commissioning date follows the delivery date rather than the 13 June DANFS/USCG date (see gaps). Carries no post-1944 service detail and no asbestos content. Ordered-date (1 Apr 1941) is the contract award context for the PC-numbered order block.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-05
-
[7]Era inference built on: DANFS construction entry (Mathis, 1941-42 build era); NavSource specifications (wooden 110' SC-497-class hull, twin GM 8-268A diesels); PCSA class data (110-foot wood-hull subchaser, two diesels, 438 delivered); GAO HRD-80-2 (Navy asbestos-use era - see ev-08) [other_primary]
- Locator
- DANFS construction entry; NavSource specifications block; PCSA subchaser class data
- Finding type
- asbestos_application
- Finding
- A wooden-hulled, diesel-powered 110-foot submarine chaser built 1941-42 sits inside the Navy's documented asbestos-use era; era-standard small-vessel applications aboard a boat of this type and period were diesel-exhaust lagging, machinery insulation, gaskets, valve packing, and electrical insulation in the confined machinery space. As a diesel craft she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply - and her wooden hull carried no structural fireproofing of the kind documented on steel combatants, narrowing but not eliminating candidate applications.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1948
- Population
- Mathis construction trades (1941-42); Navy and USCG crew (1942-46); any disposal-era trades (1947-48)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or photograph-based material identification located for SC-528. Names era-standard applications, not confirmed installed materials. No quantity. No manufacturer attribution for this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-06
-
[8]Designation cross-check: NavSource header vs NHHC DANFS SC-501 - SC-600 compilation (all SC designations, no PC), USCG official history commissioning table ('SC-528 6-13-42'), uboat.net entry (SC-528 from commissioning), and PC-461-class completed-hull list (PC-461 to PC-496, PC-542 forward - the PC-497 to PC-541 band skipped) [other_primary]
- Locator
- NavSource 12/150528.htm header designation line; DANFS SC-501 - SC-600 page; USCG V1-Escorts p. 11; Wikipedia PC-461-class article (completed-hull numbering, secondary cross-check)
- Finding type
- historical_record
- Finding
- CORRECTION: The NavSource page header titles this hull 'SC-528 ex-PC-528' and states 'Commissioned PC-528, 12 June 1942; Reclassified SC-528 in April 1943' - a convention applied identically to sister SC-527's header. Three independent checks show no commissioned PC-528 ever existed: (1) NHHC DANFS lists her as SC-528, commissioned 13 June 1942, and lists all eight Mathis-built boats (SC-507, SC-508, SC-524-SC-529) under SC designations with no PC entry; (2) the 1949 USCG official history table lists her as 'SC-528' commissioned 6-13-42 and narrates her as SC-528 from July 1942; (3) the PC-461-class completed-hull list skips the PC-497 to PC-541 band entirely, so no PC-461-class patrol craft numbered 528 was ever built. The NavSource header's 12 June date matches the builder's delivery date (yard table), not the DANFS commissioning date - the 'PC-528' is best treated as a contract-era paper designation (hulls ordered under PC program numbers) that this vessel never carried in service.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1943 (designation window)
- Limitations
- Corrects a circulating designation claim, not a material claim. Whether PC-528 existed briefly as an administrative/contract designation is not fully resolvable from public sources (Ships' Data and BuShips correspondence would settle it); what is established is that she commissioned and served as SC-528 and that no PC-461-class PC-528 vessel existed. The 'Reclassified April 1943' date in the NavSource header is unverified. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2
- 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 (1941-42) and service era (1942-46).
- 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 this session - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-08
-
[10]Batch-7903 search ledger (this record): NHHC DANFS SC-501 - SC-600; USCG official history (HyperWar V1-Escorts); NavSource SC-528/SC-527; uboat.net warship + class pages; shipbuildinghistory Mathis/Trumpy table; NVR coverage check; NIOSH/EPA yard sweep; CourtListener (blocked); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-sc-528-sc528-01 through -11
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming USS SC-528 (or PC-528) was found in the public sources searched. CAVEAT: CourtListener could not be queried this session - the authenticated helper reported the fleet-wide request budget momentarily spent (paced ~58/hr shared across sessions) on every attempt; logged as blocked in search_ledger, not as a negative result. Secondary web sweeps surfaced no qualifying case and no law-firm/listicle coverage specific to this hull beyond generic SC-497-class assertions - 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 - and the litigation repository search is a genuine open gap (throttled, not run). RG 24 deck logs (undigitized, NARA College Park), Mathis/Trumpy yard records, and Foreign Liquidation Commission sales files are the open archival leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-528-sc528-09