Evidence
6 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-6).
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[1]research packet 911-packet.md (4 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-593-pc593-pkt-911-packet-md
-
[2]NavSource Online, Submarine Chaser Photo Archive, PC-593 hull page (live page verified 2026-10-03) [other_primary]
- Locator
- PC-593 page header, milestone list, specifications block, and DANFS-availability note
- Finding type
- vessel_history
- Finding
- The PC-593 hull page records this PC-461-class submarine chaser as laid down 12 April 1942 by Dravo Corp. at Neville Island, Pittsburgh, Pennsylvania; launched 22 August 1942; commissioned 26 December 1942 at New Orleans, Louisiana; decommissioned 23 May 1946 at Subic Bay, Philippines; transferred to the Republic of China 27 August 1948; and fate unknown. Its specifications are 450 tons, 173 ft 8 in length, 23 ft beam, 10 ft 10 in draft, 20.2 knots, and complement 65. Propulsion is two 1,440-bhp Hooven-Owen-Rentschler R-99DA diesel engines, Westinghouse single-reduction gear, and two shafts.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Dravo construction workers; U.S. Navy crew; Republic of China Navy custody after 1948
- Limitations
- NavSource is a volunteer archival compilation and states that no DANFS history is currently available for PC-593. It documents identity, milestones, and specifications, not asbestos content, exposure, or the post-1948 fate.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-593-pc593-01
-
[3]National Archives, Special List 44, ship-number index to U.S. Navy deck logs (live PDF verified 2026-10-03) [other_primary]
- Locator
- SL-44 ship-number table, row 'PC-593 12/26/1942 6/30/1945'
- Finding type
- historical_record
- Finding
- NARA's SL-44 ship-number index lists PC-593 with deck-log coverage from 26 December 1942 through 30 June 1945. This establishes a National Archives hull-level deck-log lead spanning commissioning and most of the recorded U.S. service period.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-12-26 to 1945-06-30
- Population
- PC-593 crew and shipboard activities during the indexed U.S. service period
- Limitations
- The index identifies the existence and date range of the deck-log holding; the underlying logs were not retrieved or read. Deck logs may document operations, repairs, and events but do not by themselves establish asbestos content or exposure, and the index does not cover the May 1946 decommissioning or later Chinese custody.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-593-pc593-02
-
[4]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (18 October 1979), product page [gao]
- Locator
- GAO HRD-80-2 product-page description and report metadata
- Finding type
- gov_survey
- Finding
- GAO's Navy program review provides era-level context that the Navy used asbestos insulation extensively aboard ships and did not begin substituting nonasbestos insulation materials until the early 1970s. That context spans PC-593's 1942 construction and 1942-46 U.S. service period.
- Verification
- partial
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-1979
- Population
- Navy shipboard and shipyard workers, program context
- Limitations
- Program-level evidence only; it does not identify PC-593, its builder, installed materials, quantities, locations, or any person's exposure. The GAO full-text PDF was not retrievable by automated fetch in this session; the product page and prior batch source record were used only for the stated program-level proposition.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-593-pc593-03
-
[5]National Archives, 'Researching Asbestos aboard US Naval Vessel up through 1961' guided topic [other_primary]
- Locator
- NARA guided-topic page sections describing Bureau of Ships records and vessel research paths
- Finding type
- asbestos_application
- Finding
- NARA's guided topic identifies Bureau of Ships/NAVSEA correspondence, General Information Books, and engineering drawing series as the archival paths for researching asbestos aboard U.S. Naval vessels through 1961. Those series are the appropriate follow-up path for a hull-level PC-593 material record.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-10-03
- Study period
- 1942-1961
- Population
- Researchers seeking hull-level U.S. Navy material records
- Limitations
- This is a research guide, not evidence that PC-593 contained asbestos. No PC-593-specific Bureau of Ships specification, drawing, survey, or correspondence was retrieved in this batch.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-593-pc593-04
-
[6]Batch-7968 source and litigation sweep ledger; NavSource, NARA SL-44, NARA asbestos guide, GAO product page, and required CourtListener helper attempt [other_primary]
- Locator
- BATCH-7968-REPORT.md exclusions/gaps and search_ledger rows sl-uss-pc-593-pc593-01 through -08
- Finding type
- asbestos_application
- Finding
- No ship-specific asbestos documentation was located for PC-593 in the sources reviewed: no hull survey, abatement record, hazmat disclosure, product identification, or qualifying asbestos-litigation record was verified. This is a report of the search result, not proof that asbestos was absent. The required CourtListener four-query sweep was not completed because the authenticated fleet limiter stood down the first request before execution.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03 research session
- Limitations
- The negative finding is limited by the unavailable Firecrawl service, the absence of a located DANFS entry, unreviewed NARA deck-log contents, and the incomplete CourtListener sweep. It does not establish or defeat exposure, causation, legal eligibility, or the presence or absence of asbestos aboard.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-593-pc593-05