Evidence
7 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-7).
-
[1]research packet 925-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: PHANTOM
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Evidence ID
- uss-sc-686-sc686-pkt-925-packet-md
-
[2]Naval History and Heritage Command, DANFS consolidated entry SC-601–SC-700, SC-686 block (search-result text retrieved; direct page timed out during fallback fetch) [nhhc_danfs]
- Locator
- SC-601–SC-700 consolidated page, SC-686 entry
- Finding type
- vessel_history
- Finding
- NHHC’s SC-686 block identifies the hull as built at American Cruiser Co., Trenton, Michigan; keel laid 30 November 1942; launched 15 April 1943; commissioned 5 July 1943; changed from SC-686 to SCC-686 on 20 August 1945; and destroyed 20 December 1945.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1945
- Population
- American Cruiser construction trades; U.S. Navy crew
- Limitations
- Ship-specific Navy historical record for core milestones and reclassification; the block does not describe asbestos, materials, exposure, or the precise destruction circumstances. Direct retrieval of the live page timed out in this session, so the search-result text is retained as the access gap.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-01
-
[3]NavSource Online, Submarine Chaser Photo Archive, SCC-686 ex-SC-686 page; live .net URL verified 2026-10-03 [other_primary]
- Locator
- header timeline and specifications block; photo caption beneath Okinawa/Buckner Bay image
- Finding type
- vessel_history
- Finding
- NavSource records SC-686 as an SC-497-class submarine chaser laid down 30 November 1942 as PC-686 by American Cruiser Co., Trenton, Michigan; launched 15 April 1943; reclassified SC-686 and commissioned 5 July 1943; reclassified SCC-686 on 20 August 1945; grounded in Typhoon Louise on 9 October 1945 on Kudaka Shima at the entrance to Buckner Bay, Okinawa; destroyed 20 December 1945; and struck from the Naval Register 3 January 1946. Its specification block gives 110 tons displacement, 110 ft 10 in length, 17 ft beam, 6 ft 6 in draft, 21 knots, and complement 28.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1946
- Population
- American Cruiser construction trades; U.S. Navy crew; salvage/destruction personnel
- Limitations
- Per-hull compiled history and specifications; NavSource is not a Navy adjudication or asbestos survey. The page’s accompanying caption notes uncertainty between Kudaka Shima and Tsuken Jima, so only the source’s stated Kudaka Shima location and its uncertainty are carried. No material content or exposure finding is made.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-02
-
[4]NavSource Submarine Chaser Photo Archive index, SC-497 class description and SC/SCC-686 index entry; live .net URL verified 2026-10-03 [other_primary]
- Locator
- index introductory class paragraph; SC-497 class heading and SC/SCC-686 link
- Finding type
- historical_record
- Finding
- The NavSource index places SC-686 in the SC-497 class, described as 110-foot wooden-hulled World War II submarine chasers. The PC-686 label in the hull timeline is therefore a construction/commissioning designation for this wooden SC-type craft, not evidence that SC-686 was a PC-461-class steel patrol craft. The record is carried as USS SC-686, with PC-686 as an alias and SCC-686 as the later control-submarine-chaser designation.
- Verification
- verified
- Role
- correction
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- SC-497-class construction program
- Limitations
- This resolves the class/identity scope; it does not establish asbestos aboard this hull. The index is a photographic/archive compilation and does not replace a ship-specific Navy material record.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-03
-
[5]U.S. Government Accountability Office, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (1979) [gao]
- Locator
- GAO product page highlights and full-report summary
- Finding type
- gov_survey
- Finding
- GAO reported Navy-wide ship asbestos context: the Navy identified asbestos in components including clutches and electric cables, and described thermal insulation as the major shipboard use; the Navy issued a policy in 1975 to eliminate asbestos where suitable alternatives were designated. This establishes era/program context overlapping SC-686’s 1942-45 construction and service, not a finding about this hull.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1979 report describing earlier Navy practice
- Population
- Navy ships and shipyard workers
- Limitations
- Program-level GAO evidence; it does not name SC-686, the SC-497 class, American Cruiser Co., or any particular component aboard this hull. The full report PDF was reachable through the official GAO result, but no hull-specific conclusion may be inferred from it.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-04
-
[6]Era inference from the NavSource hull specification (two diesel engines, two shafts, no steam plant) and GAO HRD-80-2 program context [other_primary]
- Locator
- NavSource SC-686 specifications; GAO HRD-80-2 Navy ship asbestos context
- Finding type
- asbestos_application
- Finding
- A small wooden diesel submarine chaser built during World War II falls within the Navy’s documented asbestos-use era. If era-standard materials were used, the narrower diesel-craft pathways would be engine/exhaust lagging, gaskets, packing, electrical cable insulation, and localized fire/heat insulation where fitted; there is no boiler, steam piping, or turbine pathway shown by the hull specification.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-1945
- Population
- Construction trades and U.S. Navy crew, 1942-1945
- Limitations
- Inference only: no SC-686 material list, insulation schedule, survey, abatement record, or class-level asbestos specification was located. These are possible applications, not documented installations; no quantity, condition, or individual exposure is established.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-05
-
[7]Batch-8060 authenticated CourtListener sweep through cl-auth-search.py; four required base queries attempted/recorded in search_ledger [court_record]
- Locator
- search_ledger rows sl-uss-sc-686-sc686-01 through -04
- Finding type
- historical_record
- Finding
- No qualifying asbestos litigation is reported for SC-686, PC-686, or SCC-686 in this record. The authenticated helper was invoked for the required exact-name and hull-number opinion/docket searches, but fleet-wide pacing repeatedly prevented completion during the session; this is a litigation-search gap, not a clean negative result.
- Verification
- partial
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- The helper reported the shared fleet budget was momentarily spent and instructed a later retry; no raw or anonymous CourtListener request was made. Because the four base searches were not all completed, absence of a located hit cannot be treated as proof that no case exists. No asbestos claim, exposure allegation, or disposition is asserted.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-686-sc686-06