Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
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[1]research packet 921-packet.md (4 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: MISMATCH — real identity: USS **SC-660** — wooden submarine chaser. (Class not asserted for 660; no direct class source located.)
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Evidence ID
- uss-sc-660-sc660-pkt-921-packet-md
-
[2]NavSource Online: Submarine Chaser Photo Archive, SC-660 (ex-PC-660) - milestone list, specification block, service flags [other_primary]
- Locator
- NavSource 12/150660.htm milestone block and specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: 'Laid down 24 December 1941 by the Burger Boat Co., Manitowoc, WI; Launched 20 June 1942; Commissioned USS PC-660, 28 September 1942; Reclassified SC-660 in April 1943; Transferred to the Soviet Union 4 June 1945 and reclassified BO-311; Assigned to the Soviet Pacific Fleet 22 June 1945; Placed out of service 11 July 1956 and scrapped.' Specifications: displacement 148 t.; length 110'10"; beam 17'; draft 6'6"; speed 21 kts.; complement 28; armament one 40mm gun mount, two .50 cal. machine guns, two depth charge projector 'Y Gun,' and two depth charge tracks; propulsion two 1,540bhp General Motors (Electro-Motive Div.) 16-184A diesel engines, two shafts. Call sign Nan-William-Tare-George. Page states 'There is no DANFS history available for SC-660.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1956
- Population
- Burger Boat construction trades (1941-42); USN crew (1942-45); Soviet crew (1945-56)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates generally track NVR/DANFS but transfer-date conflicts exist (4 June here vs 5 June in Russell's appendix and uboat.net - see gaps). Page carries a template artifact: the flag line reads 'SC-634 served the Navies of the United States and the Soviet Union,' a copy-over from a sister-ship page, though the statement is true of this hull as well. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-01
-
[3]Richard A. Russell, Project Hula: Secret Soviet-American Cooperation in the War Against Japan, The U.S. Navy in the Modern World Series No. 4, Naval Historical Center, Department of the Navy, Washington, 1997 (ISBN 0-945274-35-1) - Appendix, 'U.S. Navy Combatant Ships Transferred to the USSR Under Project HULA' [nhhc_danfs]
- Locator
- Appendix table, SC block (SC660/BO-311 row); narrative pp. ~17-20 (subchaser training/repairs) and ~37-39 (returns, witnessed destruction, 1972 settlement)
- Finding type
- vessel_history
- Finding
- Russell's appendix lists this hull: SC660 -> BO-311, in the 5 June 1945 transfer group (with SC-657/BO-307, SC-663/BO-318, SC-673/BO-316, SC-713/BO-313, SC-986/BO-305, SC-1021/BO-312, SC-1060/BO-317), disposition '1956-stricken.' Narrative: Project Hula secretly transferred 149 U.S. Navy ships to Soviet custody at Cold Bay, Alaska, in the spring and summer of 1945, with Soviet crews trained by Navy Detachment 3294; wooden-hulled subchasers and motor minesweepers frequently suffered hull damage en route, nine subchasers making the ~400-mile round trip to Dutch Harbor for major repairs; subchaser training was delayed eight days. On returns: of the 149 vessels received at Cold Bay, the Soviet navy returned only 27 frigates and 15 LCI(L)s; the U.S. accepted 'witnessed destruction' for some vessels, with 59 destroyed in the Barents Sea near Murmansk and 20 at Nakhodka in 1956; a satisfactory settlement for 343 vessels was concluded in spring 1957 and the final lend-lease settlement (Settlement of Lend Lease, Reciprocal Aid and Claims) on 18 October 1972.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945-1972
- Population
- Soviet trainee crews at Cold Bay (1945); Soviet Pacific Fleet crew (1945-56)
- Limitations
- Official Naval Historical Center monograph - the authoritative published account of the transfer program. The appendix 'Disposition' column records Soviet-service disposition ('1956-stricken'), not a U.S. striking action; no U.S.-side striking date for this hull is given anywhere in the source. Transfer-date column gives 5 June for this group while NavSource and the Russian compilation give 4 June (Soviet-crew acceptance) - one-day discrepancy logged in gaps. No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-02
-
[4]Naval Historical Center compilation, 'Ships of the U.S. Navy, 1940-1945 - Submarine Chasers' (HyperWar/ibiblio mirror of the NHC reference list) - SC-497 class spec block and hull list [nhhc_danfs]
- Locator
- ships-sc.html, SC-497 Class table row 'SC-660-661' and class spec block
- Finding type
- vessel_history
- Finding
- The NHC-compiled hull list records 'SC-660-661 | 1942-44 | Lend-Lease to USSR' - official corroboration of this hull's existence, its commissioning-era window, and its Lend-Lease transfer to the USSR. The page's SC-497 class summary block: displacement 98 tons; length 110'10"; beam 17'; draft 6'6"; speed 20 knots; armament 1x3"/50, 2x2 .50-cal. mg; complement 2 officers, 20 enlisted; diesel engines, twin screws, 1,200 shaft hp.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1945
- Population
- USN crew (1942-45)
- Limitations
- Compilation-level entry naming the hull in a range row ('SC-660-661') - confirms existence and disposition category only; no individual service narrative. Class spec figures (98 tons, 20 kts, 22 complement, 3"/50 armament, 1,200 shp) differ from NavSource's ship-page spec block (148 t., 21 kts, 28, 40mm fit, 2x1,540 bhp) - standard-vs-full-load displacement and early-fit vs wartime-fit differences; logged in gaps rather than resolved. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-03
-
[5]NavSource milestone entries for SC-660 and sister hulls SC-659 (12/150659.htm), SC-661 (12/150661.htm), SC-662 (12/150662.htm) - block-level PC-to-SC reclassification pattern [other_primary]
- Locator
- NavSource 12/150660.htm ('ex-PC-660' header + milestone list); sister pages 12/150659.htm, 12/150661.htm, 12/150662.htm
- Finding type
- vessel_history
- Finding
- This hull was commissioned 28 September 1942 under the designation USS PC-660 and reclassified SC-660 in April 1943. The pattern is block-level across the neighboring SC-497 hulls: SC-659 ('delivered 7 October 1942 and commissioned USS PC-659; reclassified SC-659 in April 1943'), SC-661 ('commissioned USS PC-661, 26 October 1942; reclassified SC-661 in April 1943'), SC-662 ('delivered 10 June 1942 and commissioned USS PC-662; reclassified SC-662 in April 1943'). The PC-461-class numbering block 628-669 was reserved for these SC hulls; 'PC-660' was an administrative designation worn for roughly the first six months of service, not a PC-461-class vessel identity.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1943
- Population
- USN crew during the PC-660 designation window (Sep 1942 - Apr 1943)
- Limitations
- Corrects a naming trap: this hull never existed as a PC-461-class steel-hulled patrol craft, and sources or indexes listing 'PC-660' as a patrol craft are recording the brief administrative designation of an SC-497-class wooden subchaser. No ship was concurrently numbered PC-660 in the PC-461 class. Reclassification month ('April 1943') is as stated by NavSource for all listed sisters; an exact day is not given. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-04
-
[6]sewar.ru (Russian-language WWII weapons compilation), 'Type SC. BO-311 (until 10.01.1945 SC-660)' - Soviet-service milestones; corroborated by shipbuildinghistory.njscuba.net US Navy small-craft table ('SC-660 | Burger boat | Manitowoc WI | 148 | 110 | 28 Sep 1942 | to the USSR 1945 as BO-311') [other_primary]
- Locator
- sewar.ru BO-311 entry (Тип 'SC'. БО-311); shipbuildinghistory.njscuba.net/us-navy-small/pc2/ SC-660 table row
- Finding type
- vessel_history
- Finding
- Soviet-side milestones for BO-311: 'Entered service 1.10.1942. Accepted by Soviet crew 4.06.1945. Joined the Pacific Fleet 22.06.1945. Struck from the USSR Navy list 11.07.1956, disarmed and turned over to the stock-property department for dismantling.' The shipbuildinghistory table independently confirms builder (Burger Boat, Manitowoc), commissioning 28 Sep 1942, and transfer to the USSR in 1945 as BO-311.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945-1956
- Population
- Soviet Pacific Fleet crew (1945-56); Soviet disposal personnel (1956)
- Limitations
- Secondary compilations (a Russian-language reference site and Colton's shipbuildinghistory table), not primary registries - carried at partial verification as corroboration of the Russell appendix's '1956-stricken' disposition and NavSource's 11 July 1956 out-of-service date. sewar.ru's '1.10.1942' entry-into-service date differs by three days from the US commissioning date of 28 Sep 1942, and its parenthetical 'until 10.01.1945' former-name cutoff predates the June 1945 transfer - an unexplained quirk not propagated here. scrapping location/contractor unrecorded. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-05
-
[7]GAO HRD-80-2, 'Review of the Navy's Efforts to Protect Workers from Asbestos Exposure' (product page; published 18 Oct 1979, released 22 Oct 1979) [gao]
- Locator
- GAO HRD-80-2 product page, Highlights section
- Finding type
- regulatory
- Finding
- GAO documented Navy-wide asbestos use and the Navy's insulation-removal policies of the asbestos era: the 1975 policy removed/replaced only damaged insulation or that required for repairs, modified in 1979 to selectively replace asbestos insulation in high-maintenance areas. Program-level confirmation that asbestos insulation was standard in Navy ships of the era - the same era in which this hull was built (1941-42) and served (1942-45).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1979 (era coverage)
- Population
- Navy shipyard workers generally (era context)
- Limitations
- Program-level documentation only: GAO fieldwork yards were Long Beach and Norfolk Naval Shipyards; the report does not name this hull, this class, or this builder. Era context establishing the background asbestos environment in Navy shipbuilding, not evidence about SC-660 itself. A wooden-hulled 110-foot diesel subchaser carried materially less asbestos scope than the steam-driven combatants the policy concerned - no boilers, turbines, or steam piping aboard. Full report PDF at gao.gov/assets/hrd-80-2.pdf; product-page highlights used.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-06
-
[8]Batch-8034 search ledger (this record): NavSource SC-660 page; NHHC DANFS (no entry exists); Russell/NHC Project Hula monograph; NHC 'Ships of the U.S. Navy 1940-1945' SC list; shipbuildinghistory table; uboat.net warship record; sewar.ru BO-311; NVR; NARA catalog; web sweep for ship-specific asbestos mentions [other_primary]
- Locator
- search_ledger rows sl-uss-sc-660-sc660-01 through sl-uss-sc-660-sc660-14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, worker-compensation claim, or ship-specific litigation naming SC-660, PC-660, or BO-311 was found in the public sources searched (see search_ledger). The only asbestos content surfaced naming the builder is law-firm marketing material (mesowatch.org 'Burger Boat Company Asbestos' and similar), excluded by source policy.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - era construction practice and the GAO-documented Navy-wide asbestos environment make residual era material plausible. Equally, this 110-foot wooden diesel craft had a materially narrower asbestos scope than steam vessels. The hull was scrapped under Soviet disposal in 1956; Soviet-side material records are not accessible. CourtListener status is recorded separately in the search_ledger (blocked vs no-result as applicable). Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-07
-
[9]NARA RG 24 Logbooks of U.S. Navy Ships and Stations (deck logs, 1941-1988) - SC-660 logs not located in digitized form; Soviet-service records would rest in Russian naval archives [other_primary]
- Locator
- catalog.archives.gov (JS-rendered; direct query not executable in session)
- Finding type
- historical_record
- Finding
- This hull's 1942-45 deck logs should exist in NARA Record Group 24 (Logbooks of U.S. Navy Ships and Stations) but no digitized file unit for SC-660 was located; the catalog is JS-rendered and could not be queried via public API in this session. Deck logs are the open lead for her undocumented US-service assignments (1942-45) and her routing to Cold Bay for the June 1945 transfer. Soviet-service records (BO-311 war diary, flag assignments, disposal file) would rest in Russian naval archives and were not searched.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1956
- Limitations
- Archival lead only - establishes that a record series should exist, not its contents. NARA's digitized deck-log releases have focused on later-era ships; WWII small-craft logs remain paper/microfilm. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-660-sc660-08