Evidence
5 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-5).
-
[1]DANFS, USS Halfbeak (SS-352) - construction, wartime/postwar service, dispositions; verbatim transcription via Wayback capture of hazegray.org (live NHHC DANFS page returned 404) [nhhc_danfs]
- Locator
- DANFS service narrative and spec block
- Finding type
- vessel_history
- Finding
- Documented for this hull: Launched 19 February 1946 by Electric Boat Co., Groton, Conn. (sponsor Mrs. William Craig); commissioned 22 July 1946, Cmdr. Evan T. Shepard. New London training operations with SubRon 8; converted to a 'Guppy' type at the Portsmouth, N.H., shipyard 12 September 1949-13 January 1950 (snorkel fitted, superstructure streamlined). Arctic operations with nuclear submarine Skate (SSN-578) during the 1958 International Geophysical Year; underwater sound-equipment test and evaluation work out of New London from 1963.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-18
- Study period
- 1944-1971
- Population
- Construction trades 1944-46 (Electric Boat Co.); crew; yard trades at documented availabilities
- Limitations
- Ship-specific history only; no asbestos or material content. Yard-period asbestos disturbance is era inference, not a per-hull record. DANFS Vol. 2/3-era text ends ~1960-67 for this hull; later events rest on NavSource/NVR supplements.
- Atlas source
- true
- Evidence ID
- ev-uss-halfbeak-ss352-01
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[2]NavSource Naval History, submarine photo-archive entry (secondary archival compilation; disposition data consistent with Bauer & Roberts Register of Ships supplements) [other_primary]
- Locator
- NavSource entry header block
- Finding type
- vessel_history
- Finding
- NavSource: laid down 6 July 1944 at Electric Boat Co., Groton; decommissioned and simultaneously struck 1 July 1971; sold for scrapping 13 June 1972 to North American Smelting Corp., Burlington, NJ. Awarded Battle Efficiency 'E' 1966, 1967, and SubDiv 102 'E' 1968.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-18
- Study period
- 1944-1972
- Population
- n/a
- Limitations
- Secondary compilation, not an official record; dates/items not corroborated by DANFS or NVR are flagged in this record's gaps. Used for laid-down date, final-disposition detail, and conversion labels.
- Atlas source
- true
- Evidence ID
- ev-uss-halfbeak-ss352-02
-
[3]Era inference built on: DANFS spec block (diesel-electric drive, no boilers); BuShips Ships' Data 1945 submarine machinery tables (shipscribe.com SDB1945v1); documented yard-period events above [other_primary]
- Locator
- DANFS spec block; BuShips SDB1945v1 pp. 266-270 submarine tables; balao-class profile ev-05
- Finding type
- asbestos_application
- Finding
- A diesel-electric fleet boat built 1944-46 and maintained through Navy-yard availabilities at Electric Boat (Groton) and Portsmouth Naval Shipyard sits inside the Navy's peak asbestos-use era. Diesel-electric boats carried no boilers/steam plant: era-consistent asbestos applications are diesel exhaust lagging, engine gaskets and packing, acoustic/thermal hull insulation, galley/refrigeration insulation, and battery/electrical materials; the documented 1949-50 Portsmouth (N.H.) Naval Shipyard GUPPY conversion yard period(s) would have disturbed interior insulation.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-09-18
- Study period
- 1944-1971
- Population
- Electric Boat Co. construction trades (1944-46); yard trades at documented availabilities; crew (1946-1971)
- Limitations
- Class/era inference only - no hull-specific insulation survey or material list located for this hull. Names era-standard diesel-boat applications, not confirmed installed materials. No quantities.
- Atlas source
- true
- Evidence ID
- ev-uss-halfbeak-ss352-03
-
[4]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 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; standing policy (1975) removed asbestos insulation only when damaged or required for repairs, modified 1979 to selective replacement in high-maintenance areas - covering this hull's service-era insulation and yard-period events.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-18
- 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 blocks automated fetch, HTTP 403) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-halfbeak-ss352-04
-
[5]Batch-26 search ledger (this record): DANFS transcriptions; NavSource; NVR (where extant); Google Scholar case-law sweep; CourtListener attempted [other_primary]
- Locator
- search_ledger rows sl-uss-halfbeak-ss352-01 through -07
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or qualifying asbestos case naming USS Halfbeak (SS-352) was found. CourtListener sweeps attempted 2026-09-18: public search UI blocked by bot-challenge (HTTP 202/403) and v4 API throttled (HTTP 429, shared 125/day quota); Google Scholar case-law sweep substituted for published opinions. Exact-name "USS Halfbeak" search: no published-opinion hits. Hull-number "SS-352" search: no hits.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-18
- Study period
- 2026-09-18
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. Scholar covers published opinions only - RECAP/docket-level text was not searched (CourtListener blocked); an unresolved sweep limitation, logged in the ledger.
- Atlas source
- true
- Evidence ID
- ev-uss-halfbeak-ss352-05