Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
-
[1]research packet 923-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: MISMATCH
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Evidence ID
- uss-sc-674-sc674-pkt-923-packet-md
-
[2]NavSource Online: Submarine Chaser Photo Archive, SC-674 (ex-PC-674) - construction timeline, designation history, Soviet service, specifications; class-leader page SC-497 (12/150497) for the April 1943 reclassification pattern [other_primary]
- Locator
- NavSource 12/150674.htm - SC-497 class data block, specifications block, photo caption table; 12/150497.htm class-leader data block
- Finding type
- vessel_history
- Finding
- NavSource record for this hull: 'Laid down 31 October 1941 by the Hiltebrant Dry Dock Co., Kingston, NY; Launched 13 March 1942; Commissioned USS PC-674, 13 August 1942; Reclassified SC-674 in April 1943; Transferred to the Soviet Union 25 May 1945 and reclassified BO-306; Assigned to the Pacific Fleet 8 June 1945; Participated in the landing at Seisin (Chongzhin), China 14 August 1945; Placed out of service 30 May 1949, reclassified as a Rescue Boat, SPK-11; Scrapped 7 July 1956.' Spec block: 148 t., 110' 10" x 17' x 6' 6", 21 kts, complement 28; one 40mm mount, two .50 cal MG, two Y-gun depth charge projectors, two depth charge tracks; two 1,540bhp General Motors (Electro-Motive Div.) 16-184A diesels, two shafts. Call sign Nan-William-Victor-Love. A National Archives photo dated 11 March 1944 is the only wartime image. Page states 'There is no DANFS history available for SC-674.' The class leader's own page documents the identical designation pattern - 'Commissioned USS PC-497, 15 April 1942; Reclassified SC-497 in April 1943' - corroborating the class-wide April 1943 PC-to-SC redesignation this hull underwent.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1956
- Population
- Hiltebrant construction trades (1941-42); U.S. crew, complement 28 (1942-45); Soviet trainee and operational crews (1945-49+); Soviet scrappers (1956)
- Limitations
- Volunteer secondary compilation, not a primary registry - but the fullest public timeline for this hull. Three self-contained defects: page banner reads 'SC-986 served the Navies' (typo - page is SC-674's); 'Seisin (Chongzhin), China' is a geographic mislabel (Seishin/Chongjin is in northern Korea); transfer dated 25 May vs 26 May in the official NHC appendix (see ev-02 and gaps). Soviet-service details derive from Berezhnoi's Flot SSSR reference. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-01
-
[3]Richard A. Russell, Project HULA: Secret Soviet-American Naval Cooperation in the War Against Japan, U.S. Navy in the Modern World Series No. 4, Naval Historical Center, Department of the Navy, Washington, 1997 (ISBN 0-16-049376-5; full-text online edition) [other_primary]
- Locator
- Project HULA online edition, Appendix table (SC 674 row) and chapter text (convoy and repair passages)
- Finding type
- vessel_history
- Finding
- Official U.S. Navy publication documents this hull's transfer: Appendix 'U.S. Navy Combatant Ships Transferred ... May-September 1945' lists 'SC 674 | BO-306 | 26 May | 1956-scrapped' - transfer to the Soviet Navy at Cold Bay, Alaska, on 26 May 1945 as BO-306 (bolshiye okhotniki, 'large hunters for submarines'), Soviet disposition scrapped 1956. She was one of six subchasers in the first SC transfer group of 26 May (with SC 537, 646, 647, 661, 687). Program context from the same source: Navy Detachment 3294 at Cold Bay transferred 149 ships in 142 days; planned roster included 56 subchasers of which 32 transferred; wooden-hulled subchasers 'frequently suffered hull damage from the rough seas' - nine subchasers made the ~400-mile round trip to Dutch Harbor for repairs, delaying the subchaser program eight days; the first subchaser convoy (six boats) departed Cold Bay for Petropavlovsk on 30 May.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945 (transfer); 1956 (disposition)
- Population
- Soviet trainees and U.S. training cadre at Cold Bay (Apr-May 1945); Soviet Pacific Fleet crews (1945-49+)
- Limitations
- Authoritative official history, but the appendix is a transfer register - it gives designation, transfer date, and disposition only, not service narrative. The 30 May convoy's six-subchaser count matches the 26 May transfer group but the source does not name which boats sailed in it. Appendix sources: NAVSHIPS 250-012 (Ships' Data, 1 Jan 1949) and Berezhnoi, Flot SSSR (1994). No asbestos content. generalstaff.org hosts the NHC edition's full text.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-02
-
[4]Bureau of Ships, The Bureau of Ships During World War II (administrative history, vol. IV, Navy Department; HyperWar/ibiblio transcription) [other_primary]
- Locator
- BuShips Admin Hist WWII vol. IV, pp. 156 (Hull Insulation; Asbestos-Glass Insulation Lagging Cloth) and 218 (rubber asbestos gaskets)
- Finding type
- asbestos_application
- Finding
- Navy program documentation of asbestos materials in the era this hull was built: under 'Asbestos-Glass Insulation Lagging Cloth' the Bureau records that 'a shortage of asbestos fiber and facilities for weaving cloth necessitated development of an alternate' - twisting asbestos yarn around glass yarn produced a cloth 'of about 1/2 the weight and which used about 1/2 the asbestos used in the Standard asbestos cloth,' establishing that the standard lagging cloth was asbestos. Wartime materials improvements also include 'high temperature resistant rubber asbestos gaskets.' Hull insulation context: corkboard was 'dangerously combustible' and 'a rigid board made of glass fiber bonded with synthetic resin ... is in use on all ships for combat duty.'
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1945 (program coverage)
- Population
- All Navy construction/repair trades of the build era (program context)
- Limitations
- Program-level documentation only: establishes asbestos lagging cloth and rubber-asbestos gaskets as Navy-standard materials of the build era, not what was installed aboard this specific 110-foot wooden diesel boat. Does not name this hull or class, does not establish quantity or present-day presence (hull scrapped in the USSR in 1956). Hull-insulation passage shows the combat-ship bulkhead insulation was glass-resin board, not asbestos.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-03
-
[5]uboat.net Allied Warships, USS SC-674 (SC-674) warship record [other_primary]
- Locator
- uboat.net ship record 8891, specifications table
- Finding type
- vessel_history
- Finding
- Independent compilation corroborating this hull's identity and milestones: 'Built by Hiltebrant Dry Dock Co. (Kingston, New York, U.S.A.); Ordered 18 Sep 1941; Laid down 31 Oct 1941; Launched 13 Mar 1942; Commissioned 13 Aug 1942; End service 26 May 1945; Transferred to the USSR on 26 May 1945.' The 26 May transfer date agrees with the official NHC appendix against NavSource's 25 May; the order date 18 September 1941 is unique to this source among those consulted.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- same as ev-01 (construction and transfer windows)
- Limitations
- Secondary compilation; its class page (SC-497 class, ID 464) gives class-level specs differing from NavSource's per-hull block (98 BRT vs 148 t; complement 27 vs 28; 800 or 1440 HP vs 1,540 bhp; 15.5 or 21 knots) - conflicts carried in gaps. Does not record the PC-674 commission designation or Soviet-service detail. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-04
-
[6]Naval Marine Archive (The Canadian Collection), 'Sub Chasers Built During WWII (SC, PC, PCE, PCER, PCS)' research table, updated 17 March 2020 [other_primary]
- Locator
- navalmarinearchive.com pc2.html table, SC 674 row; navsource.net/archives/12/15idx.htm header paragraph
- Finding type
- vessel_history
- Finding
- Independent research table corroborating builder and Soviet designation: row 'SC | 674 | Hiltebrant DD | Kingston NY | 148 | 110 | 13-Aug-42 | To the USSR 1945 as BO-306' - delivery/completion 13 August 1942 (the commissioning date), 148-ton 110-foot boat, to the USSR in 1945 as BO-306. Table-wide context: 973 subchasers and related craft built by 74 boatbuilders; the SCs were the 110-foot wooden boats, PCs the 173-foot steel patrol craft, in a single pennant series - consistent with this hull's PC-674 commission and April 1943 SC reclassification. NavSource's own SC index (12/15idx.htm) counts 'five hundred eighty SC-497 Class wood-hulled, 110-foot Submarine Chasers' built during WWII with 142 to Allies under Lend-Lease - class totals in published sources conflict (see gaps).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- Hiltebrant construction trades (1941-42)
- Limitations
- Secondary research compilation (museum archive); lists the boat as SC throughout - the PC-674 commission designation and Soviet-service detail come from other rows. '13-Aug-42' is a delivery/completion column, consistent with the commissioning date in NavSource and uboat.net. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-05
-
[7]Charles Stephenson, 'Chongjin: Soviet Amphibious Operations Against Japan, 1945,' U.S. Naval Institute Naval History magazine, February 2023 [reputable_press]
- Locator
- Naval History magazine Feb 2023, operation narrative (13-17 Aug 1945) and Project Hula summary
- Finding type
- historical_record
- Finding
- Operational history of the Soviet Seishin/Chongjin landing (13-17 August 1945, northern Korea) in which NavSource places this hull (as BO-306) on 14 August: Project Hula 'provided most of the means' of the Soviet amphibious capability - about 150 ships transferred April-September 1945 including 32 submarine chasers (count matching the NHC appendix's SC rows); a reinforcing convoy of 'six frigates, two minesweepers, four submarine chasers, and nine Infantry Landing Craft' landed the 13th Marine Brigade in Chongjin harbor at 0400 on 15 August. Documents submarine-chaser participation in the operation this hull is credited with, without naming individual boats.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1945
- Population
- Soviet Pacific Fleet crews and embarked marines (Aug 1945)
- Limitations
- Corroborates the operation and the presence of (Project Hula-supplied) subchasers at Chongjin 13-17 Aug 1945; does NOT name BO-306 or any boat - the ship-specific participation claim rests on NavSource/Berezhnoi. U.S. Naval Institute publication, secondary scholarship. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-06
-
[8]Batch-8048 search ledger (this record): NHHC DANFS (404/no entry); NavSource 12/150674 + class-leader 12/150497; Russell, Project HULA (NHC 1997, generalstaff.org full text); uboat.net 8891; Naval Marine Archive table; USNI Naval History Feb 2023; BuShips admin history vol. IV; NVR (no entry - pre-1987 disposal); CourtListener (blocked - fleet pacing); NARA RG 24 deck logs (not digitized); secondary web sweep [other_primary]
- Locator
- search_ledger rows sl-uss-sc-674-sc674-01 through sl-uss-sc-674-sc674-12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming SC-674 / PC-674 / BO-306 was found in the public sources searched (see search_ledger). CAVEAT: CourtListener could not be queried this session - the authenticated helper reported the fleet-wide request budget momentarily spent on every attempt (~58/hr shared pacing); logged as blocked, not a negative result. Secondary web sweeps surfaced no qualifying case. NHHC has no DANFS entry for this hull (URL returns Page Not Found; NavSource concurs).
- 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 - and the litigation repository search is a genuine open gap (throttled, not run). Soviet disposal in 1956 forecloses any U.S. survey/abatement chain; Soviet-era records rest on secondary compilation. Deck logs and builder records are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-07
-
[9]Defects in the NavSource SC-674 page itself: banner text reads 'SC-986 served the Navies of the United States and the Soviet Union' on the SC-674 page; service line 'Participated in the landing at Seisin (Chongzhin), China 14 August 1945' [other_primary]
- Locator
- NavSource 12/150674.htm banner block and service data lines
- Finding type
- historical_record
- Finding
- CORRECTION of two self-contained errors on the otherwise best public page for this hull: (1) the page banner reads 'SC-986 served the Navies of the United States and the Soviet Union' - a leftover template line from a sister boat's page; the page is SC-674's and all body data is for SC-674. (2) 'Seisin (Chongzhin), China' mislabels the location: Seishin/Chongjin is a port in northern Korea - the Seishin Operation was the Soviet amphibious landing there 13-17 August 1945 (USNI). NavSource's participation date of 14 August sits inside the documented 13-17 August operation window.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945 (operation window)
- Limitations
- Corrects page-level and geographic errors, not a material claim. The underlying participation claim itself still rests on NavSource/Berezhnoi without an independent boat-level source (USNI confirms subchasers present, unnamed). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-08
-
[10]Era inference built on: NavSource/uboat.net spec blocks (2 x GM 16-184A diesels, wooden hull, no steam plant); Bureau of Ships WWII administrative history vol. IV (standard asbestos lagging cloth; rubber asbestos gaskets - ev-03); SC-497-class construction era 1941-44 [other_primary]
- Locator
- NavSource/uboat.net spec blocks; BuShips Admin Hist WWII vol. IV pp. 156, 218
- Finding type
- asbestos_application
- Finding
- A 110-foot wooden-hulled diesel submarine chaser built Oct 1941-Aug 1942 sits squarely inside the Navy's documented asbestos-materials era (BuShips: standard lagging cloth was asbestos; rubber-asbestos gaskets a wartime standard). Era-standard applications aboard a small diesel craft of this type were engine and diesel-exhaust lagging, flange gaskets, machinery packing, and electrical insulation. Diesel plant and wooden hull: no steam plant, so the boiler/turbine lagging pathway does not apply, and combat-ship bulkhead insulation of the era was glass-resin board, not asbestos (BuShips).
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1956
- Population
- Hiltebrant construction trades (1941-42); U.S. crew (1942-45); Soviet crews (1945-49+); Soviet scrappers (1956)
- Limitations
- Class/era inference only - no hull-specific insulation schedule, material list, work package, or builder record located for this hull. Names era-standard applications, not confirmed installed materials. No quantity. BuShips documents Navy program materials, not this boat's outfit.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-674-sc674-09