Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
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[1]research packet 1032-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED (thin sourcing disclosed
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERIFIED (thin sourcing disclosed
- Evidence ID
- uss-yms-131-yms131-pkt-1032-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-131 - construction/milestone timeline, call sign, specifications (verified live 2026-10-04); corroborated by uboat.net Allied Warships ship/9551 (ordered 1 Apr 1941) and shipbuildinghistory YMS yard table [other_primary]
- Locator
- NavSource 11/19131.htm header block and specifications block
- Finding type
- vessel_history
- Finding
- Documented for this hull: laid down 12 July 1941 by the Tacoma Boat Building Co., Tacoma, WA; launched 4 March 1942; completed 1 October 1942; call sign Nan-Able-How-Item; struck from the Naval Register 17 April 1946; transferred to the War Shipping Administration in February 1947; fate unknown. Ordered 1 April 1941 (uboat.net). Specifications per NavSource: 270 t., 136' x 24'6" x 8', 15 kts., complement 32, armament one 3"/50 dual-purpose mount, two 20mm mounts, two depth charge projectors; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Population
- Tacoma Boat construction trades (1941-42); crew (1942-46); WSA/merchant custody (1947)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates generally track official records and are corroborated here by uboat.net and the Naval Marine Archive Tacoma yard hull list. Ship-specific history only; no asbestos or material content. Spec figures conflict across sources (horsepower, draft, complement - see gaps). The NavSource page itself states 'There is no DANFS history available for YMS-131.'
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-01
-
[3]National Archives, Special List 44: List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 - ship-number list, entries for YMS-131 (RG 24 logbook holdings) [other_primary]
- Locator
- sl-44-ship-number.pdf, PDF page 115, YMS-131 entries (two rows)
- Finding type
- historical_record
- Finding
- NARA holds deck logs for this hull: Special List 44 (ship-number list, PDF page 115) records two logbook entries - 1 October 1942 through 30 November 1943, and 1 January 1944 through 30 July 1945. Combined coverage runs from the hull's completion date through 30 July 1945; the logs are the primary surviving record of her wartime service location and employment, which no public secondary source documents.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-10-01 to 1945-07-30 (listed coverage)
- Population
- Crew (1942-45 log coverage)
- Limitations
- Index-level documentation only: the logbooks are physical holdings (RG 24), not digitized, and their contents were not examined - they establish that logs exist and their coverage dates, not what the ship did or what materials were aboard. Coverage listed ends 30 July 1945 while the hull remained on the Naval Register until April 1946 - the August 1945-April 1946 interval has no listed logbooks. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-02
-
[4]HyperWar transcription of Ships of the U.S. Navy, 1940-1945 - Minecraft roster (YMS section): YMS-131 carried as in commission 1942-5 with no loss notation; class introduction and general characteristics [other_primary]
- Locator
- ships-dm.html, YMS -- Motor Minesweepers section, YMS-131 row and class introduction
- Finding type
- vessel_history
- Finding
- The official-issued minecraft roster lists YMS-131 in commission 1942-5 with no loss notation - she survived the war in U.S. service. Class context from the same source: the wood-hulled YMS type was rated as service craft and used during World War II for inshore sweeping to prepare amphibious assaults; all 481 ships of the type had the same general characteristics, and YMS-1 through YMS-134 were the two-stack group - YMS-131 is therefore a two-stack early-unit member.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1945
- Population
- Crew (1942-45)
- Limitations
- Roster-level documentation: establishes commission span and survival, not operating areas or task assignments - no theater of service is stated for this hull. '1942-5' is the roster's in-commission notation, not a precise decommissioning date. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-03
-
[5]Era inference built on: NavSource specifications block (GM 8-268A diesels, twin screws); NavSource/HyperWar/Wikipedia class description (wood-hulled 136' auxiliary motor minesweeper built at yacht yards); Kennedy v. Saberhagen litigation file documenting builder asbestos work in the 1960s (see ev-06); GAO HRD-80-2 Navy asbestos-era context (see ev-05) [other_primary]
- Locator
- NavSource 11/19131.htm specifications; HyperWar ships-dm.html YMS class block; Wikipedia YMS-1-class article (cross-check only)
- Finding type
- asbestos_application
- Finding
- A wood-hulled diesel minesweeper completed October 1942 sits inside the Navy's documented asbestos-use era; era-standard applications aboard a small diesel craft of this period were machinery insulation and diesel exhaust lagging, gaskets, valve packing, electrical cable insulation, and fireproof sheet/panel material in machinery spaces. As a diesel craft with a wood hull she carried no boilers or steam lines - the boiler/turbine lagging pathway of steam vessels does not apply, but insulation, gasket, packing, and electrical applications remain consistent with era materials.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Population
- Tacoma Boat construction trades (1941-42); crew (1942-46)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for YMS-131; no YMS-1-class insulation specification was located in public sources. Names era-standard applications, not confirmed installed materials. No quantity. The asbestos scope aboard a 136-foot wood-hulled diesel craft was materially smaller than aboard steam-driven steel warships - inference should not be inflated to steamship levels.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-04
-
[6]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)
- 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
- 2026-10-04
- 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. The report's fieldwork centered on naval shipyards and steam-fleet insulation - it does not establish that a small wood-hulled diesel minesweeper carried any particular asbestos product. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, confirmed 2026-10-04) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-05
-
[7]Kennedy v. Saberhagen Holdings, Inc., Wash. Ct. App. Div. II, Nos. 43941-7-II & 45381-9-II (unpublished opinion, 22 July 2014; WA Supreme Court petition for review No. 90792-7) - petition-file briefs hosted at courts.wa.gov [court_record]
- Locator
- courts.wa.gov petition file 90792-7 (COA Reply Brief and companion briefs); case data via WA appellate docket 43941-7-II/45381-9-II; opinion 22 Jul 2014
- Finding type
- litigation_documented
- Finding
- Litigation record documents asbestos work at this hull's builder two decades after construction: in Kennedy v. Saberhagen the plaintiffs' evidence - including the post-appeal Yost Journals of a Tacoma Asbestos employee - supported allegations that Tacoma Boat conducted asbestos insulation repair and replacement (tearing out old insulation and applying new) during ship overhauls at Pier 23 in 1964-68, with Tacoma Asbestos as exclusive insulation contractor/supplier to Tacoma Boat. The Court of Appeals reversed a summary judgment and remanded for trial; exposure was never adjudicated on the merits.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1964-1968 (alleged exposure window); 2012-2014 (litigation through petition for review)
- Population
- Tacoma Boat and Tacoma Asbestos trades; WA National Guard workers at Pier 23 (1964-68)
- Limitations
- Litigation-stage discipline: summary-judgment-stage record - the appellate holding found plaintiffs' circumstantial evidence sufficient to reach trial; it is not a finding of fact that asbestos work occurred, and it postdates this hull's 1941-42 construction by ~22 years. Yard-level context only: it concerns Tacoma Boat's 1960s Pier 23 overhaul operations and the FMS-789 floating machine shop - it does not establish materials aboard YMS-131 or any WWII-era hull. Unpublished Washington opinion (GR 14.1 citation limits). Cited URL is the live Supreme Court petition brief file (COA Reply Brief, 90792-7).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-06
-
[8]EPA CERCLA site profile, TACOMA BOATBUILDING CO (EPA ID WAD067162586), 1840 Marine View Dr., Tacoma, WA - component site of the Commencement Bay Nearshore/Tide Flats NPL site [other_primary]
- Locator
- EPA Superfund site profile, EPA ID WAD067162586
- Finding type
- environmental_record
- Finding
- The builder's yard is a federal Superfund component site: EPA lists TACOMA BOATBUILDING CO, 1840 Marine View Drive, Tacoma (established 1926, closed 1992, facility liquidated 1998) as part of the Commencement Bay Nearshore/Tide Flats NPL site.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- site listing era (1980s-present); yard operated 1926-1992
- Population
- Tacoma Boat workforce (site era); Commencement Bay remediation context
- Limitations
- Yard-level environmental listing, not a hull record and not asbestos-specific: the Commencement Bay NPL listing concerns contaminated sediments and upland sources (metals, PCBs, PAHs and related constituents) - the site profile does not establish asbestos conditions aboard hulls built there in 1941-42, and the listing concerns later-era operations.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-07
-
[9]Batch-8810 search ledger (this record): NavSource (verified live); NHHC DANFS (no entry, confirmed 404); NARA Special List 44 ship-number list (hit, two logbook entries); uboat.net; shipbuildinghistory; Naval Marine Archive Tacoma hull list; HyperWar minecraft roster; EPA Superfund; WA courts petition file; CourtListener API v4 (partially run, see below); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-131-01 through -12 (incl. 10b)
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming YMS-131 was found in the public sources searched (see search_ledger). CourtListener was partially searched this session under the fleet-paced budget: the hull-number opinion query ("YMS-131", type=o) ran and returned zero results; the remaining three base queries could not be completed and are logged as blocked - not as negative results. Secondary web sweeps surfaced no qualifying case; the only 'asbestos aboard' material is law-firm marketing content asserting asbestos on minesweepers or Navy vessels generally without hull-specific primary sourcing - excluded by source policy.
- Verification
- verified
- 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. The litigation repository search is incomplete this session (fleet-paced budget) - one of four base queries ran and returned zero; the rest are open gaps. NARA deck logs (RG 24) and any builder work-package records are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-131-08