Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
-
[1]Naval History and Heritage Command, Dictionary of American Naval Fighting Ships, "Bittern II (MHC-43)" [nhhc_danfs]
- Locator
- DANFS entry, characteristics/design paragraph
- Finding type
- historical_record
- Finding
- Bittern was built with a wooden hull and non-magnetic features as a prototype coastal mine hunter, one of a class of purpose-built minehunters developed after minesweeper losses in the Korean War. Propulsion was two 600 shp General Motors diesel engines on two shafts with controllable-pitch propellers; specification data: displacement approximately 358-360 tons full load, length approximately 144'6", beam approximately 27-28', draft approximately 6-8' (sources vary on beam/draft, figures not reconciled), speed 14 knots, complement 44, armament one 40mm gun.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 1955-1958
- Limitations
- Same live-fetch limitation as ev-01/ev-02. Beam and draft figures are inconsistent across independently retrieved summaries (27' vs 28' beam; 6' vs 8' draft) and are not reconciled here - both variants are logged in gaps rather than silently picking one. This row is the basis for the propulsion_summary field: a wooden, non-magnetic, diesel-only hull with no boilers or steam plant, which materially limits what class/era asbestos inference can reasonably apply (no steam-insulation or boiler-lagging basis exists for this hull).
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-03
-
[2]Liukonen, L.R. and Weir, F.W., "Asbestos exposure from gaskets during disassembly of a medium duty diesel engine," Regulatory Toxicology and Pharmacology 41(2):113-121 (2005) [other_primary]
- Locator
- Abstract and article, Reg. Toxicol. Pharmacol. 41(2):113-121
- Finding type
- asbestos_application
- Finding
- Peer-reviewed toxicology research on medium-duty diesel engine gaskets (engines of the general type and era relevant to Bittern's twin GM diesel propulsion plant) found that the large majority of gaskets sampled from such engines contained chrysotile asbestos, in concentrations ranging roughly 5-70% by weight, and characterized fiber release during gasket disassembly/replacement work.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-24
- Study period
- 2005 publication; engine type era-representative of 1950s-1970s medium-duty diesels
- Population
- Diesel engine mechanics/technicians (general industrial population, not Navy-specific)
- Limitations
- General diesel-engine-gasket toxicology study; not Navy-specific, not minehunter-specific, and does not name this vessel or any Navy hull. Does not establish that Bittern's own diesel engines were fitted with asbestos-containing gaskets, only that gaskets of this general engine class/era commonly contained chrysotile. Does not establish quantity, present-day presence, individual exposure, or causation. This is the only class/era asbestos-relevant citation available for this hull because Bittern has no boiler or steam plant to which the standard WWII/steamship insulation inference would otherwise apply.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-04
-
[3]U.S. General Accounting Office, HRD-80-2, "Navy Efforts To Protect Workers From Asbestos Exposure" (1980) [gao]
- Locator
- GAO product page description (full report text not retrieved this session)
- Finding type
- regulatory
- Finding
- GAO report HRD-80-2, "Navy Efforts to Protect Workers from Asbestos Exposure" (1980), documents Navy-wide (shipyard and afloat) asbestos exposure and worker-protection deficiencies identified in the late 1970s, at a program level covering Navy vessels and shipyards generally.
- Verification
- unverified
- Role
- context
- Documentation level
- context_only
- Accessed
- 2026-09-24
- Study period
- Late 1970s; report published 1980
- Population
- Navy shipyard and afloat personnel, general (late 1970s)
- Limitations
- Program-level GAO oversight report covering Navy shipyards and vessels generally (consistent with prior batches' experience that gao.gov blocks automated full-text retrieval); does not name this vessel, this vessel's class, or any coastal minehunter/small-combatant hull type specifically. Provides Navy-wide regulatory-history context only; establishes nothing ship-specific.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-05
-
[4]This batch's search ledger: DANFS/NHHC (search-triangulated); NARA RG 19 record-group guide; CourtListener API v4 name/hull searches [other_primary]
- Locator
- search_ledger rows sl-uss-bittern-amcu43-01 through sl-uss-bittern-amcu43-12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record was located for USS Bittern (AMCU-43/MHC-43) in the official/authoritative sources searched: no NHHC/DANFS asbestos or materials statement, no NARA-indexed survey or abatement record, no museum or institutional hazmat disclosure (the ship was scrapped in 2000 and has no museum/preservation status), and no docketed litigation naming the hull (see ev-07 / search_ledger).
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 2026-09-24
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard this hull - it establishes only that no qualifying documentation surfaced in the sources searched this session. A wooden-hulled, diesel-only small combatant of this era is a materially weaker asbestos-inference case than a steel-hulled steamship; that structural fact does not itself establish absence of asbestos-containing materials (gaskets, packing, deck covering, electrical insulation) aboard. Does not establish presence or absence, and establishes or defeats no exposure claim.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-06
-
[5]CourtListener API v4 search results (opinion, docket, and RECAP-document endpoints), queried 2026-09-24 [court_record]
- Locator
- search_ledger rows sl-uss-bittern-amcu43-06 through sl-uss-bittern-amcu43-09
- Finding type
- litigation_documented
- Finding
- CourtListener API v4 searches for "USS Bittern," "Bittern" + asbestos, "AMCU-43," and "MHC-43" (opinions, RECAP dockets, and RECAP documents) returned no qualifying ship-specific asbestos litigation. Two categories of non-qualifying hits were classified and excluded: (1) Craft-Stone, Inc. v. Zenitherm Co., 22 F.2d 401 (3d Cir. 1927) - an unrelated 1927 trademark/product dispute involving an asbestos-cement building-product manufacturer, matched only on the keyword "asbestos," with no vessel connection; (2) several large mass-tort/asbestos-related bankruptcy dockets (e.g., Center City Healthcare/Hahnemann, Motors Liquidation/GM, PG&E Corporation) that surfaced only because "Bittern" matches a creditor or claimant surname within thousand-entry creditor matrices - classified as name collisions with no connection to this vessel.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 2026-09-24
- Limitations
- CourtListener's index is not exhaustive (state-court and pre-electronic-filing records are unevenly covered); a negative search result does not establish that no litigation naming this hull was ever filed, only that none was located in this index under the search terms used. Establishes no litigation finding, positive or negative, beyond the searched index.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-07
-
[6]National Archives and Records Administration, Guide to Federal Records, Record Group 19 (Records of the Bureau of Ships) [other_primary]
- Locator
- RG 19 guide, Plans of U.S. Navy vessels 1908-59 series description
- Finding type
- historical_record
- Finding
- Archival lead (not retrieved - no in-person research or reproduction order performed): NARA Record Group 19 (Records of the Bureau of Ships) includes "Plans of U.S. Navy vessels, 1908-59" (approximately 7,141 items plus 1,150 microfilm rolls), a date range that covers this hull's 1955-1957 design and construction; hull-specific plans, if they survive in this series, have not been located or reviewed.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-09-24
- Study period
- 1955-1959 records
- Limitations
- Record-group/series-level mapping only - no box- or item-level retrieval performed; existence of hull-specific plans or any asbestos-relevant specification detail for this ship within this series is unknown until surveyed in person. Nothing in this row is an asbestos finding.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-08
-
[7]Cross-reference disambiguation compiled from independent search-engine retrievals of Naval History and Heritage Command / uboat.net Allied Warships of WWII content on USS Bittern (AM-36) [other_primary]
- Locator
- n/a - disambiguation note, not a hull-specific finding for AMCU-43/MHC-43
- Finding type
- historical_record
- Finding
- This record is expressly limited to the second USS Bittern (AMCU-43, reclassified MHC-43, 1955-1972/1957-1965 active commission). An earlier, unrelated USS Bittern (AM-36) was a 1919-built Lapwing-class minesweeper, home-ported in the Philippines, that was scuttled after being damaged in the Japanese air raid on Cavite Navy Yard in December 1941. The two ships share only a name; AM-36 is a different hull, different builder, different era, and different fate, and is out of scope for this record. Any name-only search hit for "Bittern" or "USS Bittern" must be checked against hull number/date range before being attributed to either vessel.
- Verification
- partial
- Role
- correction
- Documentation level
- context_only
- Accessed
- 2026-09-24
- Study period
- 1919-1941 (AM-36, out of scope)
- Limitations
- This row documents a name-collision risk, not an asbestos or vessel-history finding for AMCU-43/MHC-43 itself. AM-36 facts were not independently fetched from a primary NHHC page this session (same live-fetch limitation as ev-01) and are not otherwise used anywhere in this record.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-09
-
[8]Naval History and Heritage Command, Dictionary of American Naval Fighting Ships, "Bittern II (MHC-43)" [nhhc_danfs]
- Locator
- DANFS entry, construction/commissioning/reclassification paragraphs
- Finding type
- vessel_history
- Finding
- USS Bittern (AMCU-43) was laid down 19 August 1955 at City Island, N.Y., by Consolidated Shipbuilding Corp., launched 4 March 1957 (sponsored by Mrs. Louise Curtze), and commissioned 26 August 1957 with Lt.(jg) George C. Simpkins in command. Built from the keel up as a mine hunter rather than a sweeper, she was the only ship of the Bittern (AMCU) class and the last AMCU-type hull commissioned. After fitting out at New York Naval Shipyard she sailed to her new home port, U.S. Naval Amphibious Base Little Creek, Va., arriving 7 October 1957. She was reclassified Coastal Minehunter, MHC-43, on 7 February 1958.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 1955-1958
- Limitations
- The live NHHC page returned HTTP 503 on every direct-fetch attempt this session (standing NHHC access issue, consistent with prior batches' documented DANFS link rot). Content is instead reconstructed from the DANFS text as it is quoted/paraphrased consistently across multiple independent search-engine retrievals naming this exact URL as source; treated as partial rather than verified because no direct read of the primary document occurred this session. Establishes construction and identity only - no asbestos, materials, or condition information.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-01
-
[9]Naval History and Heritage Command, Dictionary of American Naval Fighting Ships, "Bittern II (MHC-43)" [nhhc_danfs]
- Locator
- DANFS entry, decommissioning/disposition paragraphs
- Finding type
- vessel_history
- Finding
- Bittern was decommissioned 24 September 1965. On 29 June 1966 she was transferred to the Naval Air Systems Command and loaned to the Vocaline Co. of South Bristol, Me., serving as a test platform. She was returned to the Navy on 18 January 1972 and struck from the Naval Vessel Register on 1 February 1972. In 1973 she was sold to Southern Maine Technical College (South Portland, Me.) as a training vessel for professional mariners and renamed Aqualab, serving in that role until 1996; she was sold for scrap on 19 December 2000 to Baltimore Marine Industries, Baltimore, Md.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 1965-2000
- Limitations
- Same live-fetch limitation as ev-01 (HTTP 503; content triangulated via multiple independent search retrievals rather than a direct primary read this session - see gaps). A secondary compiled source states the decommissioning date as 1 September 1965 rather than 24 September 1965; the DANFS-attributed date is adopted as controlling and the discrepancy is logged in gaps rather than silently resolved. Establishes custody/disposition timeline only - no asbestos, abatement, or hazmat information of any kind for either the Navy period or the 1973-1996 Southern Maine Technical College / Aqualab training-vessel period.
- Atlas source
- true
- Evidence ID
- ev-uss-bittern-amcu43-02