Evidence
13 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-13).
-
[1]research packet 966-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED (hull/name pairing confirmed).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-467-pkt-966-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-467 (ex-PCS-1435) - designation timeline, specifications, WSA transfer, merchant-name chain, disposal (verified live 2026-10-04) [other_primary]
- Locator
- NavSource 11/19467.htm header designation line, chronology block, specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: 'Laid down 14 June 1943 as PCS-1435 by the Gibbs Gas Engine Co., Jacksonville, FL. Reclassified as an Auxiliary Motor Minesweeper, YMS-467, 27 September 1943. Launched 22 February 1944. Completed 4 August 1944. Present in Tokyo Bay during Japanese surrender ceremony in September 1945. Struck from the Naval Register 7 February 1947. Transferred to the War Shipping Administration 7 November 1947 and sold. Sold in 1950 to G. H. Burt and R. N. Cosulich of Vancouver, British Columbia, Canada, converted to a Barge and named Cosbur. Sold again in 1950 to British Columbia Packers, Ltd. of Vancouver. Sold to the Packers Steamship Co., Ltd. and renamed Cloverleaf. Sold in 1960 to the Northwest Shipping Co., Ltd. of Vancouver and renamed Hecate Prince. Sold 7 November 1969 to Compania Naviera Oleron S. A. of Panama and renamed Hecate. Renamed Roland in 1982. Disappeared from Lloyd's Register in 1993. Fate unknown.' Specifications: displacement 270 t.; length 136'; beam 24'6"; draft 8'; speed 15 kts.; complement 32; armament one 3"/50 dual purpose gun 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. Call sign Nan-Queen-Yoke-Xray. Page states 'There is no DANFS history available for YMS-467.' No photograph carried.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1993
- Population
- Gibbs construction trades (1943-44); U.S. Navy crew (1944-47); Canadian merchant crews (1950-69); Panamanian-registry crews (1969-79)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry; milestone dates generally track official records. Two tail entries conflict with the stronger owner-account/contemporary-press record (renamed Roland at the 1975 Singapore sale, not 1982; sunk at Singapore October 1979, not simply 'fate unknown') - both carried in gaps. 'Completed' vs 'commissioned' wording carried as the milestone it reports. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-01
-
[3]NHHC / Navy Department Library, 'Allied Ships present in Tokyo Bay During the Surrender Ceremony, 2 September 1945' - YMS-467 listed under Motor Mine Sweeper (YMS) (verified live 2026-10-04) [nhhc_danfs]
- Locator
- history.navy.mil Allied Ships in Tokyo Bay page, 'Motor Mine Sweeper (YMS)' section
- Finding type
- vessel_history
- Finding
- The official NHHC Navy Department Library roster of Allied ships present in Tokyo Bay during the 2 September 1945 surrender ceremony lists 'YMS-467' in the 'Motor Mine Sweeper (YMS)' section alongside nine other YMS hulls (YMS-177, -268, -276, -343, -362, -371, -390, -415, -426, -441, -461). The page notes additions and subtractions were made based on war diary, deck log, and other sources. Establishes this hull's presence in Tokyo Bay at the Japanese surrender.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-09-02
- Population
- U.S. Navy crew (Sep 1945)
- Limitations
- Official NHHC compiled roster; establishes presence at the ceremony, not the hull's approach route, sweeping assignment, or exact position in the bay. Corroborated by the NavSource hull page ('Present in Tokyo Bay during Japanese surrender ceremony in September 1945'). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-02
-
[4]NHHC / Navy Department Library, 'United States Pacific Fleet Organization, 1 May 1945' - YMS 467 listed in the MINECRAFT, PACIFIC FLEET section (verified live 2026-10-04) [nhhc_danfs]
- Locator
- history.navy.mil Pacific Fleet Organization 1 May 1945, MINECRAFT, PACIFIC FLEET section, Mine Division Sixty YMS roster
- Finding type
- vessel_history
- Finding
- The Navy Department Library's transcription of United States Pacific Fleet organization as of 1 May 1945 lists 'YMS 467' in the MINECRAFT, PACIFIC FLEET section (Commander Minecraft, Pacific Fleet R. Adm. A. Sharp; this command also carried Task Force 18 designation in the document's index) inside the motor-minesweeper roster under Mine Squadron Twenty / Mine Division SIXTY (Comdr. M. D. Matthews). The row carries the numeral '94' in the leftmost column and no commanding officer ('..........'); neighboring YMS rows carry '94', '96', '11', '12', or 'VII' in that column and mostly named lieutenants (USNR) as commanding officers.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- U.S. Navy crew (May 1945)
- Limitations
- Establishes administrative assignment to Minecraft, Pacific Fleet on 1 May 1945 only. Does not locate the vessel geographically, establish operations, or identify her commanding officer (the row is blank). The leftmost column's '94' is unlabeled in the transcription - consistent with a subordinate mine-division or task-group marker but not asserted; column semantics unresolved. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-03
-
[5]Nauticapedia (BC's Heritage Vessel Database), vessel profile 33278 'YMS-467 (U.S.S.)' - merchant-name chain, 1951 Burrard rebuild, repowers, Nyross firsthand account, Straits Times sinking report (verified live 2026-10-04) [other_primary]
- Locator
- nauticapedia.ca vessel.php?id=33278, Historical Notes, Owners & Masters, Rebuilds, Repower blocks
- Finding type
- vessel_history
- Finding
- Heritage-database vessel profile confirms the NavSource merchant chain (U.S. Navy 1943-47; struck 7 Feb 1947; sold 7 Nov 1947; 1950 G. H. Burt and R. N. Cosulich, Vancouver, barge 'Cosbur' - named for Robert Cosulich and Robert Burt; British Columbia Packers Ltd.; Packers Steamship Co. 'Cloverleaf'; 1960 Northwest Shipping Co. 'Hecate Prince'; 7 Nov 1969 Compania Naviera Oleron S.A., Panama, 'Hecate') and adds: rebuilt 1951 as the packer 'Cosbur II' at Burrard Dry Dock; repowered with two 750bhp Union diesels (1952) and two 800bhp eight-cylinder Enterprise engines (1954). Contributed account by former owner Frank Nyross (email to Nauticapedia 22 Sep 2026): he owned the vessel as 'Hecate' at Saigon, sold her to Richard L. Pascoe of Inampco at Singapore in August 1975 (bills of sale through the Panama Consul at Singapore), she was renamed 'Roland' and chartered to the Asian/World Conference on Religion and Peace - a 1976 South China Sea mission headed by Vietnamese Buddhist monk Thich Nhat Hanh picking up Vietnamese boat people, at one point carrying 467 refugees aboard. Per the cited Friday 12 October 1979 Straits Times (Singapore) report: the vessel had been chartered by 'The World Conference on Religion and Peace' and was sinking alongside a wharf at the Guan Bee Slipway where she had been taken for repairs; the owners did not pay the bill and she was arrested by the Port of Singapore Authority. Nauticapedia tags the hull a shipwreck and records 'Disappeared from Lloyd's Register in 1993, fate unknown.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1947-1993
- Population
- Canadian merchant crews and Burrard Dry Dock workers (1950-69); Vietnamese boat-people refugees carried aboard (1976); Singapore repair/slipway workers (1979)
- Limitations
- Volunteer heritage database; the name/ownership chain is registry-compiled while the Saigon/Singapore details rest on a single firsthand contributed account (Nyross, citing bills of sale and a Freedom-of-Information source) and one contemporary press report (Straits Times, quoted not linked). The 1975 rename date (Nyross) conflicts with the page's own 'Renamed Roland in 1982' registry line - the owner account is the more specific source and is carried; conflict logged in gaps. 'Sank' (Oct 1979, alongside wharf) supersedes the 'fate unknown' framing but salvage/refloat outcome is undocumented. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-04
-
[6]uboat.net Allied Warships of WWII, USS YMS-467 (YMS-467) - order, construction, commissioning dates (verified live 2026-10-04) [other_primary]
- Locator
- uboat.net ship 9885 data block
- Finding type
- vessel_history
- Finding
- uboat.net data block for this hull: Navy - US Navy; type - minesweeper, class YMS; built by Gibbs Gas Engine Co. (Jacksonville, Florida, U.S.A.); ordered 16 November 1942; laid down 14 June 1943; launched 22 February 1944; commissioned 4 August 1944; former name PCS-1435. No commanding officers listed; no wartime events filed for this hull.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1945
- Population
- U.S. Navy crew (1944-45)
- Limitations
- Volunteer secondary database; the 'ordered 16 Nov 1942' (contract date) and 'commissioned' wording are unique contributions not in other located sources - NavSource calls the same 4 Aug 1944 milestone 'Completed'; the variant is logged in gaps. No U.S.-service activity detail. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-05
-
[7]Shipbuilding History (shipbuildinghistory.com, Tim Colton), Gibbs Gas Engine Works / Gibbs Corporation, Jacksonville FL yard output table - PCS/YMS delivery rows and yard history (verified live 2026-10-04) [other_primary]
- Locator
- shipbuildinghistory.com Gibbs page, PC 1432-1440 program row and YMS 464-472 delivery rows
- Finding type
- vessel_history
- Finding
- Yard output table for Gibbs Gas Engine Works, Jacksonville FL (founded 1911; postwar renamed Gibbs Corporation; sold to Aerojet-General Shipyards 1964; yard closed 1992). Program row: 'PC 1432-1440 | US Navy | Sub Chaser | 245d | 136 | | Completed as YMS 464-472 (see below)' - nine patrol-craft-sweeper hulls redirected to the YMS type pre-completion. This hull's delivery row: 'YMS 467 | US Navy | Minesweeper | 320d | 136 | 4-Aug-44 | Sold 1947 as Colbur, later Cloverleaf, Hecate Prince, Hecate, Roland.' Sister rows document the same yard sequence: YMS 464 (T-190 USSR), YMS 465 (T-191 USSR), YMS 466 (T-192 USSR), YMS 468 (Turkey, Kusadasi), YMS 469 (T-186 USSR), YMS 471 (later Verdin AMS 38), YMS 472 (lost 1945).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1944
- Population
- Gibbs construction trades (1943-44)
- Limitations
- Secondary yard-list compilation; confirms Gibbs construction, the 4 Aug 1944 delivery date, the PC->YMS pre-completion reclassification, and the merchant-name chain - but renders the barge name 'Colbur' where NavSource/Nauticapedia read 'Cosbur'/'Cosbur II' (spelling variant logged in gaps) and omits YMS 470 from the listed sequence. The '320d' displacement agrees with the NHHC class block, not the NavSource hull-page 270 t. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-06
-
[8]HyperWar/ibiblio transcription of NHHC 'Ships of the U.S. Navy, 1940-1945', minecraft section - YMS class description, class specification block, and hull index listing YMS-467 (verified live 2026-10-04) [other_primary]
- Locator
- ibiblio HyperWar ships-dm.html, 'YMS -- Motor Minesweepers' section (class narrative, spec block, hull table)
- Finding type
- historical_record
- Finding
- NHHC-derived minecraft index lists this hull ('YMS-467', 1942-5 group) and documents the class: 'The wood-hulled YMS proved to be one of the U.S. Navy's more durable and versatile types through a quarter-century of service...' Class spec block: displacement 320 tons (full); length 136'; beam 24'6"; draft 6'1"; speed 13 knots; armament 1 3"/50, 2 20mm, 2 depth charge tracks + 2 extensions, 2 depth charge projectors; complement 4 officers, 29 crew; diesel engines, twin screws, 500 h.p. Class note: the only significant variation was appearance - YMS-1 through 134 had two stacks, YMS-135 through 445, 480, and 481 had one, while YMS-446 through 479 had none (this hull is in the stack-less group, consistent with its PCS-derived design).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1969
- Population
- class-level
- Limitations
- Class-level specification block (320t full-load displacement, 13-knot speed, 500-hp rating, 33-man complement) differs from the NavSource hull-page block (270t, 15 kts, 2x880bhp, 32) - both are carried, variance logged in gaps; neither is a hull survey. The index confirms the hull's existence and class assignment only - no per-hull history. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-07
-
[9]Era inference built on: NavSource specifications (2 x GM 8-268A diesels, single reduction gear, twin shafts); NHHC-derived class description (wood-hulled YMS type); shipbuildinghistory yard table (Gibbs Gas Engine Works, Jacksonville); GAO HRD-80-2 (see ev-09) [other_primary]
- Locator
- NavSource specifications block; NHHC-derived class narrative; GAO HRD-80-2 program context
- Finding type
- asbestos_application
- Finding
- A wood-hulled diesel minesweeper completed August 1944 sits inside the Navy's documented asbestos-use era; era-standard asbestos applications aboard a small diesel craft of this type and period were diesel exhaust lagging, machinery gaskets, valve packing, and electrical insulation - with no steam plant, the boiler/turbine lagging pathway of steam vessels does not apply, and her wood hull carries a materially lighter outfit than steel steam-driven hulls. Asbestos aboard this hull is a reasonable era-consistent inference only.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1943-1979
- Population
- Gibbs construction trades (1943-44); U.S. Navy crew (1944-47); Canadian merchant crews, Burrard Dry Dock and repower workers (1950-69); Panamanian-registry crews and Singapore repair workers (1969-79)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for YMS-467. Names era-standard applications, not confirmed installed materials. No quantity. Product names are normalized era terms; no manufacturer attribution for this hull. Canadian merchant-era rebuilds (1950-54 conversions, repowers) may have added or removed material - undocumented either way.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-08
-
[10]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 and PDF 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 U.S. construction and service period (1943-47).
- 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. Full text not retrieved (gao.gov returns HTTP 403 to automated fetch of both the product page assets and the direct PDF, confirmed 2026-10-04) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-09
-
[11]Batch-8353 search ledger (this record): NavSource hull page and YMS index; NHHC Tokyo Bay roster and Pacific Fleet organization; Nauticapedia vessel 33278; uboat.net data block; shipbuildinghistory Gibbs table; HyperWar/NHHC minecraft index; NHHC/DANFS site search; NVR; NARA deck-log lead; NavalCoverMuseum; CourtListener (per-query status in ledger); secondary web asbestos sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-467-01 through sl-uss-yms-467-13
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming YMS-467 (PCS-1435 / Cosbur / Cloverleaf / Hecate Prince / Hecate / Roland) was found in the public sources searched. A 'YMS-467 asbestos' web sweep surfaced no qualifying hit - only generic law-firm marketing listicles that name no hull (excluded by source policy) and the GAO program report. CourtListener is a PARTIAL negative only: one of four prescribed base queries completed ('USS YMS-467' opinion, zero hits, HTTP 200 authenticated); the other three were fleet-pacing-blocked after repeated spaced attempts - logged as blocked, not as a negative result (sl-uss-yms-467-02).
- 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. Deck logs (Aug 1944 - Feb 1947 U.S. service), BuShips construction records for PCS-1435, and Canadian/Panamanian/Singapore registry files are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-10
-
[12]NARA RG 24 deck logs (lead): U.S.-service deck logs for YMS-467, August 1944 - February 1947; BuShips construction and 27 September 1943 PCS->YMS reclassification records for PCS-1435; Lloyd's Register and Singapore port/registry files for the merchant career (Cosbur - Roland); Straits Times 12 October 1979 sinking report (newspaper archive) [other_primary]
- Locator
- NARA RG 24 deck-log series (undigitized); BuShips records; Lloyd's Register; Singapore port authority records; Straits Times archive
- Finding type
- historical_record
- Finding
- Archival leads not yet developed: (1) NARA RG 24 deck logs for this hull's ~30 months of U.S. Navy service (4 Aug 1944 - 7 Feb 1947 strike) - her U.S.-service employment between completion and the 1 May 1945 fleet listing is undocumented in located sources, and the deck logs are the only likely narrative; (2) Bureau of Ships construction file and the 27 September 1943 reclassification order for PCS-1435 - would confirm the redesignation instrument; (3) Canadian registry files (Cosbur/Cloverleaf/Hecate Prince), the Panama Consul bills of sale Nyross cites, Lloyd's Register entries through 1993, and Singapore Port Authority arrest/salvage records - would resolve the rename-date and fate conflicts; (4) Straits Times 12 Oct 1979 original report - cited by Nauticapedia but not directly retrieved.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1993
- Population
- U.S. Navy crew (1944-47); merchant crews and yard workers (1947-79)
- Limitations
- Leads only - none of these record groups was retrieved this session; RG 24 WWII-era deck logs are not publicly digitized. Their existence is inferred from standard record-keeping practice and the documented service window, not verified against a catalog entry.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-11
-
[13]Correction cross-check: fleet fact-QA scoping (crew signs 960-977, re-scoped 2026-09-29); NavSource 11/19467; shipbuildinghistory Gibbs rows; Nauticapedia 33278 [other_primary]
- Locator
- NavSource 11/19467; shipbuildinghistory.com Gibbs page; nauticapedia.ca vessel 33278 (Nyross email, Straits Times citation); fleet fact-QA scoping note
- Finding type
- historical_record
- Finding
- CORRECTIONS carried: (1) Designation history - this hull was laid down as PCS-1435 and reclassified to YMS-467 on 27 September 1943, before completion; she never served as PCS-1435. Records that describe her as 'USS PCS-1435' in service are wrong; the PCS number is a construction-phase designation only. (2) Fate - NavSource's 'Disappeared from Lloyd's Register in 1993. Fate unknown' is superseded: Nauticapedia's owner account and the cited Straits Times report document her sinking alongside a wharf at the Guan Bee Slipway, Singapore, in October 1979 under Port of Singapore Authority arrest; the 1993 Lloyd's disappearance is registry bookkeeping after the loss. (3) Barge name - shipbuildinghistory renders 'Colbur'; NavSource and Nauticapedia render 'Cosbur' (from Cosulich + Burt, the two partners); 'Cosbur' carried. (4) Not the 'Prince Hecate' - a distinct vessel; Nyross's note corrects a circulating registry conflation.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1993
- Limitations
- Corrects four circulating attribution/disposition errors; rests on the owner account plus contemporary press versus later registry compilations - the Singapore loss is single-source for the sinking detail but consistent across two independent secondary compilations (Nauticapedia tags her a shipwreck). Salvage/refloat outcome undocumented. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-467-12