Evidence
7 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-7).
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[1]research packet 1038-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-20-yms20-pkt-1038-packet-md
-
[2]NavSource Online, Auxiliary Motor Minesweeper Photo Archive, YMS-20 (live hull page verified 2026-10-04) [other_primary]
- Locator
- Hull page timeline and identity block; page states no DANFS history is available for YMS-20
- Finding type
- vessel_history
- Finding
- NavSource identifies this hull as YMS-20, a YMS-1-class auxiliary motor minesweeper: laid down 27 June 1941 by Greenport Basin and Construction Co. at Greenport, Long Island, New York; launched 1 November 1941; completed 18 April 1942; transferred to France 20 October 1944 as Gentiane (D-327); sold to France 21 March 1949; struck from the Navy Register 28 April 1949; reclassified D-08 and M-648; decommissioned 11 August 1960; fate unknown.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1960
- Population
- Greenport construction trades (1941-42); U.S. Navy crew (1942-44); French naval personnel (1944-60)
- Limitations
- NavSource is a compiled secondary archive, not the underlying Navy or French register. It supplies the hull identity and timeline used here, but does not document asbestos, does not separately establish a formal U.S. commissioning or decommissioning date, and does not establish the post-1960 fate beyond 'unknown.'
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-01
-
[3]National Archives, Special List 44, by Ship Numbers, PDF page 116 (live PDF downloaded and verified 2026-10-04) [other_primary]
- Locator
- PDF p. 116, YMS-20 row
- Finding type
- historical_record
- Finding
- NARA's Special List 44 indexes Navy deck logs for YMS-20 covering 9 April 1942 through 19 October 1944.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-04-09 to 1944-10-19
- Population
- YMS-20 crew during indexed log coverage
- Limitations
- Finding-aid coverage only: this row establishes the dates and identity of the indexed deck-log holding, not the contents of the logs. The coverage dates are not asserted as commissioning or decommissioning dates, and the underlying logs were not reviewed for operations, maintenance, materials, or exposure evidence.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-02
-
[4]National Archives, Researching Asbestos aboard US Naval Vessel up through 1961 (live page verified 2026-10-04) [other_primary]
- Locator
- NARA guided-topic page introduction and ship-specific research-pathway sections
- Finding type
- regulatory
- Finding
- NARA identifies asbestos in U.S. Navy materiel from 1941-1961 as a research topic and directs researchers to Bureau of Ships records, ship information books, specifications, inspection reports, and engineering drawings for ship-level research.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-10-04
- Study period
- 1941-1961
- Population
- Navy ships and shipyard personnel within the guide's 1941-1961 research scope
- Limitations
- Research-pathway guidance, not a YMS-20 material finding. The guide does not name this hull or establish that asbestos was installed aboard it; the responsive RG 19/RG 143 records were not located or reviewed in this pass.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-04
-
[5]YMS-1 class and hull specifications in NavSource, combined with NARA's asbestos research guide; no hull-level material source located [other_primary]
- Locator
- NavSource hull/class specification block; NARA asbestos guide research scope
- Finding type
- asbestos_application
- Finding
- YMS-20 was a wooden-hulled, diesel-powered YMS-1-class minesweeper completed in 1942. For a vessel of this type and era, diesel machinery, exhaust, gaskets, packing, electrical systems, and insulation board are plausible asbestos-relevant application categories, but no cited source confirms any of them aboard YMS-20.
- Verification
- inferred
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1960
- Population
- Construction trades (1941-42); machinery crew and maintainers (1942-44); later French personnel (1944-60)
- Limitations
- Class/era inference only. It is not evidence that asbestos was installed aboard this hull, supplies no quantity or manufacturer, does not establish remaining material or individual exposure, and does not create a steam-boiler or turbine pathway for this diesel vessel.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-05
-
[6]CourtListener authenticated API v4 searches through /Users/charlesfletcher/devin-prompts/cl-auth-search.py; four mandated base attempts and one overflow-qualified variant, 2026-10-04 [court_record]
- Locator
- search_ledger rows sl-uss-yms-20-yms20-05 through -09; cl-*.json and cl-*.err helper outputs
- Finding type
- litigation_documented
- Finding
- No qualifying asbestos litigation record naming USS YMS-20 or YMS-20 was located in the completed CourtListener results. The hull-number opinion base query returned 324 broad results, all 20 returned hits were name collisions or unrelated litigation; the required 'YMS-20 asbestos' opinion subset was then attempted and stood down by the fleet pacing gate. The exact-name opinion, exact-name docket, and hull-number docket attempts also stood down before a result returned.
- Verification
- partial
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Population
- CourtListener opinion and RECAP docket indexes
- Limitations
- Partial access-limited negative finding, not proof that no litigation exists. No litigation stage is assigned because no qualifying vessel-specific asbestos pleading, discovery record, trial finding, or judgment was retrieved. No anonymous, raw, or v3 request was made; no further variants were run after the pacing stand-down.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-06
-
[7]Batch research ledger: NavSource hull page; NARA Special List 44; NARA asbestos research guide; CourtListener authenticated helper; Firecrawl connector unavailable [other_primary]
- Locator
- search_ledger rows sl-uss-yms-20-yms20-01 through -09
- Finding type
- historical_record
- Finding
- No ship-specific asbestos survey, abatement record, hazmat disclosure, engineering material list, asbestos product-identification record, or fully resolved qualifying asbestos-litigation record for YMS-20 was located in the sources reviewed. No additional primary designation alias beyond the documented French-service designations Gentiane (D-327), D-08, and M-648 was located.
- Verification
- partial
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. NARA identifies undigitized Bureau of Ships and related technical records as the proper path for hull-level research; those records were not reviewed. Firecrawl live-web search was unavailable because its keyless MCP quota reported an approximately 23-hour retry window, so direct retrieval of the available authoritative pages and PDF was used as fallback.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-20-yms20-07