Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
-
[1]research packet 962-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED (thin sourcing)
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERIFIED (thin sourcing)
- Evidence ID
- uss-yms-454-pkt-962-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-454 (ex-PCS-1407) page - full designation/build/loss timeline and spec block [other_primary]
- Locator
- Timeline block and Specifications block, navsource.net/archives/11/19454.htm (live URL verified 2026-10-04)
- Finding type
- vessel_history
- Finding
- Laid down 24 August 1943 as Patrol Craft Sweeper PCS-1407 by the Greenport Basin and Construction Co., Greenport, NY; reclassified Auxiliary Motor Minesweeper YMS-454 on 27 September 1943; launched 23 October 1943; completed 30 June 1944; grounded by Typhoon Louise on Tsuken Shima off Okinawa 9 October 1945; destroyed 20 December 1945; struck from the Naval Register 3 January 1946. Specs: 270 t, 136 ft x 24.5 ft x 6.1 ft, 12 kts, complement 33, one 3in/50 DP mount + two 20mm + two depth charge projectors, two 880bhp GM 8-268A diesels with Snow and Knobstedt single reduction gear, two shafts.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1946
- Population
- Wartime crew (approx. 33)
- Limitations
- NavSource is a volunteer-run naval-history archive, not an official record - but it is the accepted reference for YMS-class build/loss data and cites the crew photograph collection of Winfred C. 'Buddy' Breed, Jr. No asbestos information; establishes vessel history only.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-01
-
[3]NHHC, 'Typhoons and Hurricanes: Pacific Typhoon at Okinawa, October 1945' - extract from Commander in Chief, Pacific Fleet and Pacific Ocean Areas report on the Surrender and Occupation of Japan, Annex A and Appendix III [other_primary]
- Locator
- Appendix III damage table, row 'YMS 454'; Annex A storm narrative (live URL verified 2026-10-04)
- Finding type
- historical_record
- Finding
- The official CINCPAC report extract documents Typhoon 'Louise' (9 October 1945) striking ships and craft confined in Buckner Bay (Nakagusuku Wan), Okinawa - 12 sunk, 222 grounded, 32 damaged beyond ships' force repair, 36 killed, 47 missing, ~100 seriously injured. Appendix III 'Typhoon Damage at Okinawa' lists: 'YMS 454 - Grounded - Beyond economical salvage.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-10-09 to 1945-11-19 (progress-report window)
- Population
- Crew aboard at time of grounding; salvage personnel (ComServDiv 104)
- Limitations
- Official ship-specific loss documentation. 'Beyond economical salvage' is a disposition assessment, not a complete description of the wreck's fate - it does not state the method of the subsequent destruction (20 December 1945 per NavSource) or whether remains persist. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-02
-
[4]NHHC, 'United States Pacific Fleet Organization, 1 May 1945' - Minecraft, Pacific Fleet roster [other_primary]
- Locator
- Minecraft, Pacific Fleet section, YMS roster, row 'YMS 454' (live URL verified 2026-10-04)
- Finding type
- vessel_history
- Finding
- YMS 454 is listed in the official U.S. Pacific Fleet organization as of 1 May 1945 under MINECRAFT, PACIFIC FLEET (Commander Minecraft, Pacific Fleet, R. Adm. A. Sharp). No commanding officer is entered for the hull in the roster.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- Wartime crew
- Limitations
- Establishes fleet assignment on one date (1945-05-01); does not give a subordinate squadron/division assignment for this hull or operational detail. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-03
-
[5]The Bowline, Greenport Basin & Construction Co. employee newsletter, 31 January 1945 (digitized by Cutchogue New Suffolk Free Library) [other_primary]
- Locator
- PDF p.1 'GREENPORT'S CONTRIBUTION TO NAVAL STRENGTH' and WOODEN HULLS sponsor table (live URL verified 2026-10-04)
- Finding type
- historical_record
- Finding
- The builder's own newsletter lists 'YMS 454 - Mrs. W. J. McNeil' in its WOODEN HULLS sponsor table, identifying the launch sponsor. The same issue documents the yard's wartime wooden-hull output: 453 Naval vessels of all types delivered to date, 53 wooden hulls built since 1941, and employment rising from 337 (May 1941) to over 1,000 (June 1942).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1945
- Population
- Greenport Basin & Construction shipyard workforce (~1,044 employees + subcontractor staff by June 1942)
- Limitations
- Primary builder-produced source (company newsletter) hosted by a public library - authentic but informal; sponsor identification only, not a construction specification. The wooden-hull framing covers the yard's product line, which included this hull. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-04
-
[6]NavSource Submarine Chaser/PC/PCS index, rows PCS-1405 through PCS-1413 (designation chain) [other_primary]
- Locator
- Index row 'PCS-1407 ex-PC-1407 Reclassified YMS-454' (live URL verified 2026-10-04)
- Finding type
- vessel_history
- Finding
- Designation chain for this hull: contracted/laid out as PC-1407 (index entry 'ex-PC-1407'), laid down as PCS-1407 (24 August 1943), reclassified YMS-454 (27 September 1943) - before launch (23 October 1943) and before completion (30 June 1944). She therefore never served under the designations PC-1407 or PCS-1407; YMS-454 is the only designation under which she operated.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943
- Limitations
- Index-level evidence: the ex-PC-1407 contract-stage designation rests on the NavSource index; no BuShips contract document was located. The reclassification date and laid-down-as-PCS-1407 sequence are also on the ship's NavSource detail page (ev-uss-yms-454-01). Corrects any record implying service as PCS-1407.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-05
-
[7]NavSource YMS-454 spec block (machinery facts) + era construction practice for wooden diesel minesweepers [other_primary]
- Locator
- Specifications block, navsource.net/archives/11/19454.htm
- Finding type
- asbestos_application
- Finding
- Era inference only: the hull was wooden and diesel-powered (two GM 8-268A engines), so there was no boiler/steam-system lagging aboard. For wooden diesel motor minesweepers of this era, asbestos-relevant applications were limited to engine exhaust lagging, gaskets and packing, and electrical wiring insulation; wartime wooden-hull construction is documented by the builder's own newsletter (ev-uss-yms-454-04).
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1943-1945
- Population
- Construction trades (Greenport, 1943-44); wartime engine-room crew
- Limitations
- No product document names this hull or class. The NavSource spec block establishes the machinery only; the asbestos content of any material aboard is inference from era practice, not ship-proven. Does not establish quantity, exposure, or present-day presence.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-06
-
[8]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 construction (1943-44) and entire service era (1944-45).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979 (program period covered spans this hull's construction era)
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull - and a wooden-hulled 270-ton diesel sweeper had materially less asbestos-relevant plant than the steam combatants that dominate the GAO record. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-07
-
[9]Batch-8325 search ledger (this record): NavSource detail + index; NHHC Pacific Typhoon extract; NHHC Pacific Fleet organization 1 May 1945; NHHC DANFS (no entry); Naval Vessel Register (out of scope); Cutchogue library Bowline PDF; NARA digitized deck-log list; CourtListener; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-454-01 through sl-uss-yms-454-10
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming USS YMS-454 (or PCS-1407 / PC-1407) was found in the public sources searched (see search_ledger). CAVEAT: CourtListener could not be queried this session - the fleet pacing budget (shared ~58/hr token bucket against the 1,400/day quota) was contended on four spaced attempts; logged as blocked in search_ledger, not as a negative result. Secondary web sweeps surfaced no qualifying case - the only 'asbestos aboard' material is law-firm marketing content asserting asbestos without 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 - era inference remains plausible, and the litigation repository search is a genuine open gap (blocked, not run). The hull was destroyed in place at Okinawa in December 1945, so no present-day survey or abatement record can exist. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-08
-
[10]National Archives, 'Navy Deck Logs Available in the National Archives Catalog' (digitized-log index) - YMS-454 absent; RG 24 deck logs undigitized [other_primary]
- Locator
- NARA digitized deck-log index (live URL verified 2026-10-04); YMS-454 not listed
- Finding type
- historical_record
- Finding
- YMS-454 does not appear on NARA's published list of digitized Navy deck logs (the YMS hulls listed are only the later bird-named AMS/MSC(O) conversions). Deck logs for this hull (1944-45, including the Typhoon Louise loss entries and post-grounding disposal reports) exist in RG 24 but are not digitized - the open archival lead for any ship-specific record.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1946 (log period)
- Limitations
- Confirms absence from the digitized index only; the physical records' existence is expected under standard Navy deck-log practice but was not independently verified this session. Deck logs would document operations and loss, not necessarily materials content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-454-09