Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
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[1]research packet 1027-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-100-yms100-pkt-1027-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-100 page - build/milestone timeline, specifications, commanding officer, Soviet transfer and disposal [other_primary]
- Locator
- NavSource 11/19100.htm header block, specifications block, commanding-officer table
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 15 July 1941 by Astoria Marine Construction Co., Astoria, OR; launched 12 April 1942; completed 20 June 1942; transferred 17 August 1945 to the Soviet Union and reclassified T-602; assigned to the Soviet Pacific Fleet 31 August 1945; placed out of service 17 October 1955 and laid up; struck from the Soviet Navy list 25 June 1956; struck from the Naval Register 29 October 1956; sunk between 28 and 30 June 1956 in the Sea of Japan in agreement with the United States. Specifications listed: 136 ft length, 24 ft 6 in beam, 6 ft 1 in draft, 13 knots, complement 33, one 3"/50 dual-purpose mount plus two 20mm mounts and depth-charge gear; two 880 bhp GM 8-268A diesel engines, twin shafts; call sign November-Alpha-Echo-Bravo. CO: LTJG William H. Ross, USNR (1944-1945), per photo caption.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1956
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates here are corroborated in outline by shipbuildinghistory.com ('To the USSR 1945 as T 602', delivered 20-Jun-42) and by NARA/NHHC records, but the exact Soviet-side dates (31 Aug 1945 assignment, 17 Oct 1955, 25 and 28-30 Jun 1956) rest on NavSource alone. Contains no asbestos content. Displacement printed as '27 t' is an evident typo (class index reads 320 tons).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-01
-
[3]NHHC, 'United States Pacific Fleet Organization, 1 May 1945' (Navy Department Library online reading room transcription) [nhhc_danfs]
- Locator
- MINECRAFT, PACIFIC FLEET section, un-numbered YMS listing (p. ~133 of the roster transcription)
- Finding type
- vessel_history
- Finding
- Official fleet organization roster lists 'YMS 100' under MINECRAFT, PACIFIC FLEET (Commander Minecraft, Pacific Fleet, R. Adm. A. Sharp), with commanding officer Lt. (jg) W. H. Ross (USNR) - establishing this hull was a U.S. Pacific Fleet minecraft in commission on 1 May 1945.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- Crew of YMS-100 (complement ~33)
- Limitations
- Administrative roster establishes organizational assignment and CO as of 1 May 1945; it does not state the ship's operating area, base, or materials. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-02
-
[4]NARA catalog records for this hull: muster rolls 'YMS-100, 6/20/42-7/31/45' (NAID 193168332, RG 24, Roll 8064, 118 images, digitized); war diary 'USS YMS-100 - War Diary, 1/1/44 to 4/30/44' (NAID 78532175, RG 38, Roll A1060, 121 images, digitized); war diary 'USS YMS-100 - War Diary, 5/1/44 to 7/31/44' (NAID 78639075, RG 38, Roll A1149, 106 images, digitized) [other_primary]
- Locator
- catalog.archives.gov file units 193168332, 78532175, 78639075
- Finding type
- historical_record
- Finding
- NARA catalogs and has digitized primary records for this hull: complete wartime muster rolls opening 20 June 1942 (the completion/in-service date) and running to 31 July 1945, plus two ship war diaries covering 1 January - 31 July 1944. These records establish wartime U.S. Navy service and are the primary leads for operations detail and any aboard-ship work practices.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-06-20 to 1945-07-31
- Population
- YMS-100 crew (complement ~33) 1942-1945
- Limitations
- Records exist and are digitized but page-level review was not performed in this session - operational detail (bases, ports, repairs) is asserted only as a lead. No deck-log file unit titled for YMS-100 was located in the digitized Logbooks series; the task brief's deck-logs citation (6/20/1942-8/16/1945) could not be confirmed as described - see gaps. Muster/war-diary content contains no known asbestos documentation.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-03
-
[5]NARA catalog full-text search hits for 'YMS-100' in digitized war-diaries series (RG 38 and RG 181) [other_primary]
- Locator
- catalog.archives.gov search results for quoted 'YMS-100' (RG 38 WWII War Diaries; RG 181 First Naval District Monthly War Diaries)
- Finding type
- historical_record
- Finding
- Catalog full-text search returns 'YMS-100' OCR hits inside: First Naval District monthly war diaries across 1942-1945 (RG 181, Boston); Navy Yard Pearl Harbor war diaries for early 1943 (e.g., NAID 134087782, 134106325, 134154770, 134192198); and COMTASK-UNIT 96.3.3 war diaries for October 1944 - February 1945 (e.g., NAID 78654194, 78691394, 139807767, 139836964, 139889613). Task Group 96.3 was the Marshalls-Gilberts Patrol and Escort Group - 'convoy protection between the Marshall Islands and forward area ports... patrol craft for Marshalls-Gilberts bases... anti-submarine warfare' (NHHC annotated bibliography, HyperWar). The pattern is consistent with an early-war First Naval District period, Pearl Harbor-area presence in early 1943, and Marshall Islands patrol/escort service in late 1944 - early 1945 preceding the Cold Bay transfer.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1945
- Limitations
- OCR-level hits establish only that the string 'YMS-100' appears in those volumes - each mention needs page-level review to confirm it denotes this hull in an operational capacity (versus a listing or a coincidental numeric string). Operating-area sequence is suggested, not confirmed. Contains no known asbestos documentation.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-04
-
[6]NHHC DANFS entries for sister YMS hulls describing class construction, e.g., Rhea II (YMS-299) - 'a wooden hulled minesweeper'; NHHC YMS-445 photo page - class employment description; NHC Project HULA monograph - '36 wooden-hulled motor minesweepers (YMS)' [nhhc_danfs]
- Locator
- history.navy.mil DANFS R (rhea-ii) body text; NMUSN YMS-445 photo page
- Finding type
- vessel_history
- Finding
- Official Navy descriptions of the YMS class: DANFS entries for sister motor minesweepers (YMS-299, YMS-306, YMS-321, YMS-479) consistently describe the type as 'wooden hulled'/'wooden-hulled' motor minesweepers; the NHC Project HULA monograph describes the class outright as 'wooden-hulled motor minesweepers (YMS)' and notes the transferred YMSs 'had short service lives, and all were decommissioned by the mid-1950s'; the NHHC YMS-445 page describes the class role - 'These yard craft patrolled navy yards and adjacent areas, and they were also used by the Allies as part of the Lend-Lease Program.' Establishes wooden construction and diesel propulsion for the class to which YMS-100 belongs.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1945 (class)
- Limitations
- Class-level description from official sources - does not itself establish any detail aboard YMS-100 specifically. Wooden hull and diesel plant are consistent with every class source located. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-05
-
[7]shipbuildinghistory.com, Astoria Marine Construction yard table (Tim Colton's Shipbuilding History) [other_primary]
- Locator
- shipbuildinghistory.com/shipyards/small/astoria.htm, ASTORIA MARINE table, YMS-100 row and yard history paragraph
- Finding type
- vessel_history
- Finding
- Builder-yard table corroborates this hull: 'YMS 100 - US Navy - Minesweeper - 278d - 137 - 20-Jun-42 - To the USSR 1945 as T 602' - the first YMS hull delivered by Astoria Marine Construction, followed in the same block by YMS-101 (17-Jul-42), YMS-102 (22-Aug-42), and YMS-103 (19-Sep-42). Yard history: Astoria Marine Construction, originally Astoria Shipbuilding, was started in 1924 by Joe Dyer on the Lewis and Clark River at Jeffers Slough and closed in 2013.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1942 (build); yard 1924-2013
- Population
- Astoria Marine Construction yard workers, 1941-1942 (build context only)
- Limitations
- Secondary research compilation (well-regarded shipyard reference compiled from USMC/Navy delivery records) - corroborates NavSource dates and the Soviet designation T-602 but is not a primary registry. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-06
-
[8]Richard A. Russell, 'Project HULA: Secret Soviet-American Naval Cooperation in the War Against Japan' (Naval Historical Center, Department of the Navy, 1997; U.S. Navy in the Modern World Series No. 4), Appendix 'U.S. Navy Combatant Ships Transferred to the [Soviet Navy] May-September 1945' - official monograph reproduced at generalstaff.org [nhhc_danfs]
- Locator
- generalstaff.org/WW2/Pubs/HULA/Project_HULA.htm, Appendix table YMS-100 row; text sections on Cold Bay selection, transfer roster, and lend-lease settlement/witnessed destruction
- Finding type
- vessel_history
- Finding
- Official Navy-published transfer record names this hull: the HULA appendix lists 'YMS 100 - T-602 - 17 Aug. - 1956-destroyed' among the 36 wooden-hulled motor minesweepers (YMS) transferred under Project Hula. The monograph establishes that Cold Bay, Alaska (Fort Randall) was the single transfer point for the program ('the most suitable transfer point'; 149 vessels received there), that American crews trained Soviet replacement crews before transfer, and that the postwar settlement mechanism was 'witnessed destruction' - the Soviets deliberately sank unreturned ships in view of American naval authorities, including 20 vessels at Nakhodka near Vladivostok in 1956. YMS-100's '1956-destroyed' disposition falls in this witnessed-destruction program (NavSource gives the specific sinking window of 28-30 June 1956 in the Sea of Japan, consistent with the Nakhodka site).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-1956
- Population
- YMS-100 U.S. crew to 17 Aug 1945; Soviet T-602 crew 1945-1955
- Limitations
- The appendix names the hull, Soviet designation, transfer date, and disposition year/mechanism - it does not give the exact sinking date or location (NavSource supplies 28-30 June 1956, Sea of Japan). Soviet-service detail 1945-1955 is not covered for this specific hull. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-07
-
[9]Class-level inference based on NavSource YMS-100 specifications (diesel plant, wooden hull per NHHC class sources) and Batch-07 diesel-craft inference pattern [other_primary]
- Locator
- Derived from ev-01 specifications block and ev-05 class description
- Finding type
- asbestos_application
- Finding
- Era inference: a wooden-hulled motor minesweeper completed in June 1942, inside the Navy's asbestos-era construction window, with a diesel plant (two GM 8-268A diesels - no boilers, no steam system) would have carried era-standard asbestos applications appropriate to a small diesel craft - engine exhaust insulation and lagging, machinery gaskets and packing, electrical insulation, winch/windlass brake linings, and deck coverings - rather than the boiler/steam-line lagging that dominated steam-vessel asbestos loads.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1956
- Population
- Construction trades (Astoria, 1941-42); YMS-100 crew 1942-45; Soviet T-602 crew 1945-55
- Limitations
- Class/era inference only - NOT a hull-specific finding. No drawing, manual, survey, or material list for YMS-100 was located; the diesel plant means the largest asbestos categories of steam ships are not expected aboard, but it does not exclude asbestos in the applications listed. Does not establish quantity, location, or present-day relevance (the hull was sunk in 1956).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-08
-
[10]Batch-8776 search ledger (this record): NARA catalog (muster rolls, war diaries, full-text hits); NHHC Pacific Fleet organization roster; NHHC DANFS class pages; NavSource; shipbuildinghistory.com; NHC Project HULA monograph; CourtListener base queries x4 (all count=0) [other_primary]
- Locator
- search_ledger rows sl-uss-yms-100-yms100-01 through sl-uss-yms-100-yms100-13
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located for YMS-100: no ACM survey, no abatement contract, no hazmat disclosure, and no museum documentation (hull sunk 1956, nothing survives). CourtListener returned zero hits on all four required base queries - exact-name opinion, exact-name docket, hull-number opinion, hull-number docket - so no litigation of any kind names this hull, qualifying or otherwise.
- 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-consistent materials would be expected in the candidate applications listed under ev-08. Does not establish that asbestos was or was not present; does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-100-yms100-09