Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
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[1]DANFS, Diploma (AM-221) (builder, dates, service narrative, reclassification; verbatim NHHC text via Wayback capture of history.navy.mil/research/histories/ship-histories/danfs/d/diploma.html, 2025-01-25 - the live NHHC page returns 404; verbatim match confirmed against the hazegray/losthistory.net transcription) [nhhc_danfs]
- Locator
- DANFS entry 'Diploma' (AM-221), specifications block + service narrative (Wayback capture of history.navy.mil, 2025-01-25)
- Finding type
- vessel_history
- Finding
- DANFS record for this hull: launched 21 May 1944 by Tampa Shipbuilding Co., Inc., Tampa, Fla.; sponsored by Mrs. F. J. Erwin, Jr.; commissioned 15 July 1944, Lieutenant A. B. Baxter, USNR, in command. Arrived Pearl Harbor 12 January 1945 towing the disabled Army freighter FS-318; convoy escort to Guam and Eniwetok, returning 17 February; sailed 23 February for Ulithi minesweeping exercises preparing the Okinawa invasion; preinvasion minesweeping off Okinawa 24 March - 1 April 1945, then patrolled during the initial landings; repairs at Ulithi 17 April - 15 May; convoys to Guam and Saipan; back on patrol off Okinawa from end of May; swept mines 4 - 31 July in support of the final 3d Fleet raids on the Japanese mainland; post-surrender sweeping in the East China Sea-Ryukyus and the Tsugaru Straits into Ominato Naval Base, northern Honshu; sailed 20 November for the west coast, San Diego 20 December; departed 5 January 1946 for Mobile, Ala., via New Orleans, arriving Orange, Tex., 12 May; out of commission in reserve there 3 September 1946; reclassified MSF-221, 7 February 1955; three battle stars for World War II service. Spec block: dp. 530; l. 184'6"; b. 33'; dr. 9'9"; s. 15 k.; cpl. 104; a. 1 x 3"; cl. Admirable.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1943-1955
- Population
- Tampa Shipbuilding construction trades 1943-44; wartime crew (design complement 104)
- Limitations
- DANFS documents service history and specifications, not materials or asbestos content. DANFS does not print a laid-down date (1943-07-01 rests on NAVSHIPS 250-011 and NavSource) and predates the 1962 Mexican transfer, so it does not cover disposal. Live NHHC page 404s (standing batch-01 defect); verbatim text confirmed against the 2025-01-25 Wayback capture and the hazegray transcription. The HyperWar transcription mistypes two dates ('6 January 1946' and '7 February 1956') - the archived NHHC text and hazegray both read 5 January 1946 and 7 February 1955; official dates carried.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-01
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[2]Bureau of Ships, Ships' Data U.S. Naval Vessels, Vol. II: Mine Vessels (less DM and CM), Patrol Vessels, Landing Ships and Craft, NAVSHIPS 250-011, 13 April 1945 (GPO 1945; scan via shipscribe.com) [other_primary]
- Locator
- NAVSHIPS 250-011, Mine Vessels - Mine Sweepers (AM) tables: builder/date table (DIPLOMA AM221 row, p. 33 of the section) and propulsion/generator table (p. 32) + AM214-311 class characteristics block (pp. 26-27)
- Finding type
- vessel_history
- Finding
- The official 1945 BuShips register names DIPLOMA, official number AM221, in the mine-sweeper tables: builder Tampa S.B. Co., Inc.; keel laid 1 July 1943; launched 21 May 1944; date of first commission 15 July 1944; engine manufacturer/model 'C.B. GSB-8' (Cooper Bessemer), shaft horsepower 1,710, 'Nat. Sup.' (National Supply Co.) reduction gear. The AM214-311 class characteristics block prints: 2 propellers, diesel drive with single reduction gears; length 184'6" o.a., 180'0" w.l.; extreme beam 33'0"; full-load displacement 945 tons (at limiting draft); trial speed 14.8 knots; armament 1 x 3"/50 cal. D.P. and 2 twin 40mm A.A. mounts.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1943-1945 (register data as of 13 April 1945)
- Population
- Tampa Shipbuilding construction trades 1943-44; wartime crew
- Limitations
- Contemporaneous official register - establishes identity, builder, construction dates, and propulsion for this hull; contains no materials or asbestos information. The class block prints 'Diesel' (geared) drive for AM214-311 - this class carried no boilers. The 1,710 figure is the class-table shaft-horsepower entry and is not labeled per-engine or aggregate. OCR noise in the scanned table does not affect the row's substance. A secondary compilation (HyperWar ship page) prints 'diesel-electric, 950 shp' - the official register is carried.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-02
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[3]NavSource Online: Mine Warfare Vessel Photo Archive, Diploma (MSF 221) ex-AM-221 (photo/data archive page; via Wayback capture 2025-01-20 - live navsource.org unreachable from this session) [other_primary]
- Locator
- NavSource AM-221 archive page, ship chronology block + specifications block + CO roster (Wayback capture 2025-01-20)
- Finding type
- vessel_history
- Finding
- NavSource archive record for this hull: laid down 1 July 1943 by Tampa Shipbuilding Co., Tampa, FL; launched 21 May 1944; commissioned USS Diploma (AM 221) 15 July 1944; decommissioned 3 September 1946 at Orange, TX (the Naval Vessel Register of 1 January 1949 lists her out of commission, in reserve as December 1945); reclassified Fleet Minesweeper (Steel Hull) MSF-221, 7 February 1955; transferred to Mexico in 1962 and renamed ARM DM-17; renamed ARM Cadete Francisco Marquez (C 59) in 1994; struck from the Navy list in 2000; sunk in 2004 as an artificial reef 'off Veracruz, Mexico.' Commanding-officer roster printed (LT Albert Bickley Baxter, USNR, 15 Jul 1944 - 9 Dec 1945; LTJG Frederick Charles Kull, USNR, to 5 May 1946; LTJG Byron Primm Finegan, USNR, to 31 Aug 1946; Chief Boatswain Billy Gilbert Angeroth, USN, to 3 Sep 1946). Spec block (945 t. fl; 184'6" x 33' x 9'9"; 14.8 kts; complement 104; 1 x 3"/50 DP, one twin 40mm, six 20mm, hedgehog, four K-guns, two depth-charge tracks; two Cooper Bessemer GSB-8 diesels, National Supply Co. single reduction gear, two shafts) is consistent with the official NAVSHIPS table where they overlap.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1943-2004 (compiled)
- Population
- Tampa Shipbuilding construction trades 1943-44; U.S. Navy crew 1944-46; Orange reserve-fleet caretakers 1946-1962; Mexican Navy crew 1962-2000
- Limitations
- Private photo/data archive, not an official source: the Mexican-service details (DM-17, C-59 rename 1994, stricken 2000, sunk 2004), the NVR 1 January 1949 reserve listing, and the CO roster rest on a secondary compilation. The printed sinking location 'off Veracruz' conflicts with the Espiritu Santo park regulations compendium and dive-community records placing the C-59 wreck off Isla Espiritu Santo, La Paz, BCS - see ev-04 and gaps. Which navy's 'Navy list' the 2000 strike refers to is ambiguous (Mexican-service stricken 2000 per secondary listings; the U.S. Naval Register strike date is not printed in located sources - sister hulls transferred to Mexico were struck 1 May 1962). No materials or asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-03
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[4]Compendio Espiritu Santo (Espiritu Santo Archipelago national-park regulations compendium, CONANP-area document mirrored by Club Cruceros, La Paz) + Divernet wreck feature 'Shipwrecks of the Southern Sea of Cortez' [other_primary]
- Locator
- Compendio Espiritu Santo PDF, 'Subzone of Public Use Artificial Reefs' section; divernet.com shipwrecks-of-the-southern-sea-of-cortez (C-59 entry); underwaterphotography.com dive-site ID 15307
- Finding type
- vessel_history
- Finding
- Disposition corroboration: the Espiritu Santo park-regulations compendium lists three sunken vessels serving as artificial reefs on the western coast of the Espiritu Santo Archipelago - 'the Lapas 03, Fang Ming and C-59 Francisco Marquez' - placing the renamed hull (ARM Cadete Francisco Marquez, C-59) as an artificial reef off Isla Espiritu Santo, La Paz, Baja California Sur. Dive-community records (Divernet; underwaterphotography.com) identify the C-59 wreck as ex-USS Diploma (AM-221), sunk 2004, lying on her port side at ~9-21 m, a recreational dive site.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 2004-present
- Population
- Mexican Navy reef-preparation crews 2004 (undocumented); recreational divers (contemporary)
- Limitations
- Secondary sources, not a Mexican Navy record: the compendium is a reproduced park-regulations document hosted on a yacht-club site and names the reef (C-59 Francisco Marquez) without a sinking date; the 2004 sinking and Diploma identity rest on dive-community and secondary listings. This row establishes that the hull was deliberately sunk as a dive reef (and, per secondary accounts, 'cleaned of contaminants' beforehand) - no survey manifest, cleaning record, or materials inventory was located, and nothing here establishes whether asbestos was removed before sinking or went down with the hull.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-04
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[5]O'Neil v. Crane Co., 53 Cal. 4th 335 (2012) [court_record]
- Locator
- Opinion factual background section (Bureau of Ships specifications; gaskets and packing discussion)
- Finding type
- regulatory
- Finding
- Published California Supreme Court opinion reviewing WWII-era Navy practice: the Bureau of Ships issued detailed material specifications for shipboard equipment, and during the early 1940s Navy specifications required that internal gaskets and packing materials in valves contain asbestos - 'at that time, asbestos was the only' material meeting the specification. Establishes that era Navy specifications mandated asbestos-containing gaskets/packing aboard warships of Diploma's construction period.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-22
- Study period
- 1943-1944 (specification era); 2012 (opinion)
- Population
- WWII-era Navy crews and shipyard workers (class context)
- Limitations
- Class/era context only. The opinion describes the steam propulsion system of 'a typical warship' (hundreds of valves controlling steam flow); Diploma was diesel-driven with no steam plant, so the steam-valve population described does not map directly onto this hull. Establishes era specification practice, not the presence, quantity, or condition of asbestos aboard this specific ship.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-05
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[6]Fleischer WE, Viles FJ Jr, et al., 'A health survey of pipe covering operations in constructing naval vessels,' J Ind Hyg Toxicol 1946 Jan;28:9-16 (PMID 21016030) [other_primary]
- Locator
- PubMed citation record PMID 21016030; J Ind Hyg Toxicol 1946;28:9-16
- Finding type
- asbestos_application
- Finding
- The wartime federal industrial-hygiene survey of pipe-covering operations in naval vessel construction (conducted during WWII naval shipbuilding, published January 1946) documents that insulation work on ships under construction used asbestos-containing materials - the standard practice environment in which this hull was built at Tampa in 1943-44.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-22
- Study period
- 1944-1946 (survey/publication)
- Population
- WWII naval-vessel pipe coverers and insulators (class context)
- Limitations
- Industry-wide wartime survey, not a hull record - does not name this vessel, the Tampa yard, or the Admirable class; its reassuring conclusion ('not a dangerous occupation') is itself now criticized as deeply flawed (Kelly, New Solut 2026;36:138-150, PMID 42307414). Establishes era context only - that asbestos insulation work was performed in WWII naval vessel construction - not materials aboard AM-221.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-06
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[7]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 the Navy's asbestos-protection program and its 1975/1979 insulation-removal policies covering the WWII-built fleet - program-level confirmation that Navy ship construction of Diploma's era incorporated asbestos insulation and that the material was managed as a known hazard aboard Navy vessels.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-22
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation, not hull-specific; establishes era context for WWII Navy construction, not materials aboard AM-221 - which left active service in September 1946 and was transferred to Mexico in 1962, before the Navy's documented asbestos-management program existed. Does not establish individual exposure, quantities, or presence at any time. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-07
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[8]Atlas shipyards.json record: tampa-bay-shipbuilding (Tampa Shipbuilding Co./TASCO; evidence_tier 3; documented product categories incl. asbestos insulation on steam systems, gaskets, valve packing, brake linings, fireproof panels, pipe insulation; WWII peak employment 16,000) [other_primary]
- Locator
- shipyard-exposure-map/client/src/data/shipyards.json, yard_id tampa-bay-shipbuilding
- Finding type
- asbestos_application
- Finding
- Builder-yard context: Diploma's hull was built at Tampa Shipbuilding Co. (TASCO), which carries a tier-3 yard-level record in the Atlas dataset with documented asbestos product categories. WWII-era construction at this yard places the hull inside a documented asbestos-use environment.
- Verification
- inferred
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-22
- Study period
- 1943-1944 (build)
- Population
- Tampa Shipbuilding construction trades 1943-44
- Limitations
- Yard-level findings describe the workplace, not this hull's materials; they do not establish that asbestos was installed aboard AM-221, nor in what quantity or locations. The yard dataset entry is a compiled record (evidence array not public in this file); no qualifying published asbestos opinion naming Tampa Shipbuilding was located in the searches that could be completed - pre-war Florida cases found (1923-1939) are non-asbestos. No hull-level record exists. Yard dataset entry cited as cross-link only.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-08
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[9]Batch-1199 search ledger (this record): NHHC DANFS (live + Wayback capture), hazegray and HyperWar transcriptions, NAVSHIPS 250-011 Ships' Data 1945, Naval Vessel Register, NavSource archive, MARAD Vessel History Database, CourtListener opinion index (blocked) and Google-indexed courtlistener.com, VA BVA decision index, NARA catalog, PubMed, GAO, Espiritu Santo park-regulations compendium, general web index [other_primary]
- Locator
- search_ledger rows sl-uss-diploma-am221-01 through sl-uss-diploma-am221-14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, BVA decision, or docketed case naming USS Diploma under AM-221, MSF-221, ARM DM-17, or Cadete Francisco Marquez (C-59) was found in the public sources searched (see search_ledger). CourtListener API sweep could not be completed on 2026-09-22 (authenticated 2,800/day quota exhausted; HTTP 429); web-index spot checks surfaced only marketing listicles that name the vessel without evidence.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 2026-09-22
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - the hull was built 1943-44 at a yard carrying a tier-3 asbestos record in the yard dataset, and its post-1962 life was Mexican naval service ending in a deliberate reef sinking for which no contaminant-removal manifest was located. Does not establish that asbestos is or was not present; does not establish or defeat any claim of exposure or legal eligibility. CourtListener sweep remains open - logged as a gap, not a clean negative.
- Atlas source
- true
- Evidence ID
- ev-uss-diploma-am221-09