Evidence
14 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-14).
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[1]research packet 993-packet.md (1 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-niagara-pg52-pkt-993-packet-md
-
[2]DANFS, Niagara VII (PG-52) - construction, acquisition, commissioning, service narrative, 7 April 1943 air action, loss narrative, battle star (live NHHC page verified) [nhhc_danfs]
- Locator
- DANFS service narrative and spec block
- Finding type
- vessel_history
- Finding
- Documented for this hull: the seventh Navy ship named Niagara, for Fort Niagara - 'captured from the British by American forces 28 November 1812.' A yacht built in 1929 as Hi-Esmare by Bath Iron Works, Bath, Maine; purchased by the Navy 16 October 1940 from Mrs. H. Edward Manville of New York City; converted to a gunboat by the New York Navy Yard; renamed Niagara 12 November 1940; commissioned at New York 20 January 1941, Lt. Edwin W. Herron in command. Tended MTB Squadron 2 (Miami/Key West/Guantanamo) Feb-Mar 1941; Naval Torpedo Station Newport summer 1941; departed New York 30 August 1941 for Pearl Harbor (arrived 9 October); Hawaiian Sea Frontier patrol; departed 29 November as escort for Fiji-bound convoy - at sea during the Pearl Harbor attack; returned 15 December; tender to MTB Squadron 1 until 1 April 1942; convoy escort to San Diego then Coco Solo, Canal Zone, tending torpedo boats guarding Panama Canal approaches; overhaul at New York Navy Yard summer 1942; Newport school ship for MTB training squadron; departed for Southwest Pacific 27 November 1942; reclassified the Navy's first motor torpedo boat tender AGP-1 on 13 January 1943; Noumea 17 January; Tulagi 17 February, tending PT boats on Guadalcanal security patrols. On 7 April 1943, moored in the Maliali River with minesweeper Rail (AM-26), she fought nine attacking planes at treetop level. Departed Tulagi 22 May 1943 toward New Guinea; the following morning attacked by high-flying twin-engine bombers - near misses, then a direct forecastle hit and damaging near-misses; 14-inch hole six feet below the waterline flooded storerooms, a passageway, and the engine room; uncontrolled fire forward; abandoned ship; PT-146 and PT-147 took off crew; 'not one of Niagara's 136 officers and men was killed or seriously wounded'; PT-147 torpedoed her gasoline tanks and she exploded and sank in less than a minute. One battle star for WWII service. Spec block: dp. 1,922 (f.); l. 267'; b. 35'4"; dr. 17'; s. 16 k.; cpl. 139; a. 2 3".
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1929-1943
- Population
- BIW yacht construction trades (1928-29); New York Navy Yard conversion/overhaul trades (1940-42); crew (1941-43); PT-boat personnel tended (1941-43)
- Limitations
- Ship-specific history only; no asbestos or material content. DANFS gives the departure date (22 May) and 'the following morning' for the fatal attack, which resolves to 23 May - NavSource's headline 'Sunk 22 May 1943' conflicts (see ev-13). Complement in spec block (139) differs from the 136 aboard at loss and Shipscribe's 119. Yacht name spelled 'Hi-Esmare' here vs 'Hi-Esmaro' in NavSource/GD-BIW sources.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-01
-
[3]NavSource Online: Gunboat Photo Archive, Niagara (AGP 1) ex-PG-52 ex-CMc-2 - designation timeline, construction events, specifications, commanding officers, NARA-captioned photography (live page verified) [other_primary]
- Locator
- NavSource 12/09052.htm header block, timeline, specifications, CO table, photo captions
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 14 November 1928 as the steel-hulled yacht Hi-Esmaro by Bath Iron Works, Bath, Maine; launched 7 June 1929; delivered 20 August 1929; collided with a tanker off Newport, RI in July 1929 and returned to Bath Iron Works for repairs; acquired by the Navy 16 October 1940 and conversion began to a Coastal Minelayer at New York Navy Yard, Brooklyn; classified CMc-2 31 October 1940; renamed Niagara 12 November 1940; reclassified Patrol Gunboat PG-52 15 November 1940; commissioned USS Niagara (PG-52) 20 January 1941; reclassified Motor Torpedo Boat Tender AGP-1 13 January 1943; lost to enemy air attack, finished off by a torpedo from PT-147. Specifications: 1,922 t. fl; 267'; 35'4"; 17'; 16 kts; complement 139; two 3"/50 DP mounts; propulsion two 1,500shp Cooper-Bessemer diesel engines, two shafts. Commanding officers: LT Edwin Warren Herron (20 Jan 1941 - 27 Nov 1941); LT David Buncombe Coleman (27 Nov 1941 - 23 May 1943). NARA-captioned photos: 80-G-451131 (Pearl Harbor, 13 Oct 1941); 80-G-7293 (Suva, Fiji, Feb 1942, with HMNZS Leander and USS Chicago, photographed from USS Curtiss); 19-N-29806 (entering Pearl Harbor 31 Mar 1942); 80-G-68537 (burning east of Cape Surville, San Cristobal Islands, 23 May 1943, PT-146 and PT-147 alongside).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1928-1943
- Population
- BIW construction trades (1928-29); NYNY conversion/overhaul trades (1940-42); crew (1941-43)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates generally track NVR/DANFS but its headline 'Sunk 22 May 1943' conflicts with the 23 May date on its own transcribed NARA photo caption and with NHHC (see ev-13). Contains no asbestos content. The July 1929 collision predates the 20 August 1929 delivery, i.e., during trials - plausible as stated, flagged in gaps.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-02
-
[4]Shipscribe (Stephen S. Roberts, compiled from Navy register and BuShips records), USS Niagara (AGP-1) class page - register data, strike date, design provenance, loss narrative, material detail [other_primary]
- Locator
- Shipscribe AGP-1 class page: design/construction table, disposition table (Strike 2 Jun 43), class notes
- Finding type
- vessel_history
- Finding
- Register-derived data for this hull: twin-screw diesel yacht HI-ESMARO, Bath Iron Works hull 123, designed by Henry Gielow for Hiram Edward Manville, 'chairman of the Johns-Manville Corp.', delivered 20 August 1929; original measurements 1,062 tons light, 266.4' oa x 35.2' x 14.5'. Navy purchased her from Mrs. Manville in 1940 (Time magazine, 4 Nov 1940, described her as 'a glossy, seagoing jewel with a $10,000 figurehead, seven baths, teak paneling, a royal suite' and noted the Navy retained the teak). Acquired as coastal minelayer CMc-2, reclassified PG-52 15 Nov 1940 'with the intent that she would operate as a MTB tender'; converted at the New York Navy Yard; a July 1941 squadron report to CNO found 'though small and incompletely fitted for tender duties, she has performed valuable services'; reclassified AGP-1 13 Jan 1943 'when the AGP classification was created.' On 23 May 1943 badly damaged by near misses and a hit from Japanese high-altitude bombers; PT-147 sank the wreck with a torpedo; 'the fatal fire that broke out forward in the vicinity of the bomb hit was assessed to have been due mainly to her interior construction being entirely of wood.' Struck 2 June 1943. Register complement 119; light displacement 1,333 tons; diesel, 2 screws, 3,000 HP, 12.5 kts.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1928-1943
- Population
- Crew (1941-43); NYNY conversion trades (1940-42)
- Limitations
- Secondary compilation from official records, not the register itself - but sourced to register/BuShips data and internally consistent with DANFS/NHHC. The 'entirely of wood' interior detail is a loss-assessment note, not a material survey - says nothing about insulation content. Spec figures differ from DANFS/NavSource on tonnage, speed, and complement (see gaps). Ship Notes line 'Acquired as CMc-1' is an internal typo - the header and all other sources agree CMc-2.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-03
-
[5]NHHC photo catalog, 80-G-68536 'USS NIAGARA (AGP-1)' - official caption and original date (live page verified) [nhhc_danfs]
- Locator
- NHHC 80-G-68536 catalog page, caption and original-date fields
- Finding type
- vessel_history
- Finding
- NHHC's official photo record for this hull: 'Burning after being bombed by a Japanese aircraft while en route from Tulagi to New Guinea on 23 May 1943. She sank later that day. PTs moving in to assist are three of the following boats: PT-144, PT-145, PT-146, PT-147, PT-148, or PT-110.' Original date field: Sun, May 23, 1943. Copyright owner: National Archives.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-05-23
- Population
- Crew and rescuing PT-boat personnel (23 May 1943)
- Limitations
- Photographic record of the loss only; no asbestos or material content. The 23 May 1943 date on NHHC's own catalog record is the authority carried for the loss date (see ev-13).
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-04
-
[6]HistoryNet, 'Adorned with teak and a gilded bowsprit, SS Hi-Esmaro was rechristened USS Niagara' - feature drawn on ship's surgeon Frederick Ludwig's account and crewman Joseph Tropea's narrative [reputable_press]
- Locator
- HistoryNet 'combat-yacht' feature article (America in History)
- Finding type
- vessel_history
- Finding
- Documented for this hull: Hiram Manville, 'proprietor of the Johns-Manville Company,' put a down payment on a diesel yacht at Bath Iron Works in July 1928; the name Hi-Esmaro combined Hiram, Estelle, Romaine, and Manville and also named the family estate at Pleasantville, NY; Romaine Manville christened the yacht; designer Henry J. Gielow; two Bessemer diesels; sister yacht Vanda built simultaneously. The government bought Hi-Esmaro from Romaine Manville for $150,000 in October 1940; converted at the Brooklyn Navy Yard. For the tender role, shipfitters added reserve fuel tanks of about 50,000 gallons. Lt. (jg) John F. Kennedy briefly bunked aboard Niagara at Tulagi in early 1943 while awaiting a PT boat command. Medical officer Lt. Frederick Ludwig described teak officers' mess paneling with 'linen and silver services that had belonged to Manville.' Destination at loss: Woodlark Island, to establish a PT base. Crew totaled 136; none killed or seriously wounded.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1928-1943
- Population
- Lt. (jg) John F. Kennedy (transient berth, early 1943); Lt. Frederick Ludwig, MC (medical officer); crew 136
- Limitations
- Secondary journalism reconstructing from participants' accounts (Ludwig, Tropea, PT-110's Lt. Patrick Munroe) - not a Navy record. It dates the fatal departure 'Friday, May 22, 1943' (a day/date mismatch - 22 May 1943 was a Saturday); NHHC and Shipscribe fix the sinking 23 May (see ev-13). No asbestos content; the Johns-Manville proprietorship is provenance context only.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-05
-
[7]General Dynamics Bath Iron Works, Legacy Vault ship record HI-ESMARO (hull 123 photo file) and owner page 'H.Edward Manville' - builder's own archive (live pages verified) [other_primary]
- Locator
- gdbiw.com/ship/hi-esmaro/ ship card and gdbiw.com/ship-owner/h-edward-manville/ owner card
- Finding type
- vessel_history
- Finding
- The builder's archive confirms for this hull: HI-ESMARO, ship type 'T.S. Diesel Yacht' (twin-screw diesel), length 266'5", draft 14'6", commissioned/delivered August 20, 1929, owner 'H.Edward Manville'; the archive photo file is cataloged 'Hull-123-Hi-Esmaro.jpg' matching Shipscribe's builder's-hull-123 attribution.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1928-1929
- Population
- BIW construction trades (1928-29)
- Limitations
- Builder's summary record only - dimensions and owner; no material or asbestos content, no construction specifications beyond diesel-yacht type. Diesel propulsion confirmed: no steam plant aboard, hence no boiler/turbine insulation pathway.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-06
-
[8]Era inference built on: DANFS spec block and NavSource/Shipscribe/GD-BIW propulsion data (twin-screw Cooper-Bessemer diesels - no steam plant); NavSource conversion timeline (New York Navy Yard 1940-41, overhaul summer 1942); shipyard-exposure-map documented asbestos records for bath-iron-works and brooklyn-navy-yard; era industrial-hygiene/litigation literature (ev-08 through ev-11) [other_primary]
- Locator
- DANFS spec block; NavSource specifications and conversion timeline; shipyards.json product records for bath-iron-works and brooklyn-navy-yard
- Finding type
- asbestos_application
- Finding
- A 1929 diesel yacht given a wartime Navy conversion inside both builder's and conversion yard's documented asbestos-use era: era-standard applications aboard a vessel of this type and period were engine and exhaust-system insulation/lagging, gaskets, valve packing, electrical insulation, and fireproof/joiner insulation in bulkheads and accommodation spaces - applied both at original yacht construction (1928-29, BIW) and during Navy conversion/overhaul work (1940-42, New York Navy Yard, a yard with documented Kaylo-era asbestos use). As a diesel vessel she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply; her documented hazard pathway was combustible interior construction (all-wood interior assessed as feeding her fatal fire) rather than machinery lagging.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1928-1943
- Population
- BIW yacht-construction trades (1928-29); NYNY conversion/overhaul trades (1940-42); crew (1941-43)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for Hi-Esmaro/PG-52. Names era-standard applications, not confirmed installed materials. No quantity, no manufacturer attribution for this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) - product page and highlights (live page verified via Firecrawl) [gao]
- Locator
- GAO product page HRD-80-2, Highlights block
- Finding type
- gov_survey
- Finding
- GAO reviewed the Navy's efforts to protect workers from asbestos exposure, documenting asbestos insulation use aboard Navy ships and a removal/replacement policy dating to 1975 (modified 1979) - confirming that Navy ship construction and conversion work of this hull's service era (1940-43) fell within the Navy's asbestos-use period.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979 (review period); era context for 1940-43
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Fieldwork yards were Long Beach and Norfolk Naval Shipyards - not Bath or New York Navy Yard. Content via product-page description (full PDF linked but not extracted this session).
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-08
-
[10]Ferris BG Jr, Heimann H. 'Shipyard health problems' (1976) - NIOSH-archived conference review (CDC Stacks), critically reviewing the WWII-era studies of hazards to welders and pipe coverers in shipyards (live page verified) [other_primary]
- Locator
- CDC Stacks record cdc/184094, abstract and subject fields (Asbestos; Pipe coverers; shipyard studies)
- Finding type
- gov_survey
- Finding
- A NIOSH-archived, peer-reviewed 1976 review confirms that federal researchers surveyed pipe coverers and welders in naval-vessel construction during WWII - the trade that installed asbestos insulation aboard ships under construction and conversion, the same work performed on this hull at the New York Navy Yard in 1940-42. The review documents that 'the duration of exposure to asbestos... is of prime importance' for the shipyard asbestos-health record.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- WWII studies; review published 1976
- Population
- WWII-era shipyard pipe coverers and welders (reviewed studies)
- Limitations
- Era/trade-level documentation only - describes WWII shipyard pipe-covering work generally; does not name this hull, Bath Iron Works, or the New York Navy Yard, and establishes no exposure aboard any specific vessel.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-09
-
[11]Austin v. Raybestos-Manhattan, Inc., 471 A.2d 280 (Me. 1984) - certified-question opinion on comparative negligence in a Bath Iron Works asbestos death case (live page verified via Firecrawl) [court_record]
- Locator
- Opinion text, factual-background section (471 A.2d at 281-82)
- Finding type
- litigation_documented
- Finding
- Court-verified asbestos exposure at this hull's builder: Blaine Austin worked as a painter and cleaner at Bath Iron Works from 1952 through fall 1976, was exposed to asbestos in the course of his employment, and died in October 1977 of pleural mesothelioma; a federal jury found Raybestos-Manhattan negligent and that its negligence proximately caused the cancer, while also finding contributory negligence. The Maine Supreme Judicial Court answered the certified question (comparative negligence applies to the strict-liability claim) on January 17, 1984.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1952-1984 (employment, trial, opinion)
- Population
- Bath Iron Works painter/cleaner trades (1952-76 exposure window)
- Limitations
- Yard-level litigation, not a hull record - Austin's exposure window (1952-76) post-dates this hull's 1928-29 construction and 1943 loss; documents BIW's asbestos environment, not materials aboard Hi-Esmaro/PG-52. Disposition described exactly: certified question answered; the jury's negligence finding stood but judgment entered for defendant under the then-applied comparative-negligence rule. Does not establish exposure aboard this hull or any individual's eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-10
-
[12]In re Joint Eastern & Southern Districts Asbestos Litigation, 772 F. Supp. 1380 (S.D.N.Y. 1991) (Weinstein, J.) - consolidated asbestos-liability opinion addressing New York (Brooklyn) Navy Yard worker claims [court_record]
- Locator
- 772 F. Supp. 1380 (S.D.N.Y. 1991); shipyard-exposure-map brooklyn-navy-yard evidence ev-brooklyn-navy-yard-04
- Finding type
- litigation_documented
- Finding
- Federal litigation record documents asbestos exposure claims by workers at the New York Navy Yard - the yard that converted Hi-Esmaro to a warship in 1940-41 and overhauled Niagara in summer 1942. The Atlas shipyard dataset (verified 2026-07-24) records this opinion as documenting Brooklyn Navy Yard worker asbestos exposure in the consolidated Eastern/Southern Districts asbestos litigation.
- Verification
- partial
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- WWII-era exposure; opinion 1991
- Population
- New York Navy Yard workers and estates (consolidated litigation)
- Limitations
- Yard-level litigation context only - does not name this hull and establishes no exposure aboard it. ACCESS GAP: the Justia full-text URL returned a reCAPTCHA block to automated fetch this session (2026-10-04); the citation rests on the shipyard dataset's prior verification plus the official reporter citation (772 F. Supp. 1380, S.D.N.Y. 1991). Opinion content not re-verified line-by-line this session.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-11
-
[13]Batch-8537 search ledger (this record): live DANFS/NHHC; NavSource; Shipscribe; NHHC photo catalog; GD-BIW Legacy Vault; HistoryNet; GAO; CDC Stacks; Justia; NVR check; CourtListener (blocked - fleet pacing budget spent); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-niagara-pg52-01 through -12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, material list, abatement contract, or verified litigation naming USS Niagara (PG-52/AGP-1/CMc-2) or the yacht Hi-Esmaro was found in the public sources searched. CAVEAT: CourtListener was only partially searchable this session - the 'USS Niagara' docket query completed (326 hits; the returned 20-result page was entirely name collisions - Niagara County, City of Niagara Falls, and unrelated parties - with no qualifying asbestos case), while the 'USS Niagara' opinion query completed once but its output was truncated before full classification (the visible hit was a utility name collision), and the 'PG-52' opinion/docket base queries plus the overflow-permitted 'USS Niagara asbestos' docket variant could not run because the fleet-wide authenticated pacing budget stayed spent across fifteen spaced attempts over ~75 minutes (helper exit 2). Logged as partially-blocked in search_ledger, NOT a clean negative result. NVR check produced no detail page (loss predates the register). Secondary web sweeps surfaced no qualifying case naming this hull.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - the 1943 loss froze the hull at its wartime material state, and no postwar survey opportunity ever existed. The litigation repository search is a genuine open gap (throttled, not run). NARA deck logs (RG 24), BuShips conversion work packages (RG 19), and any loss-board of inquiry records are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-12
-
[14]Loss-date cross-check: NHHC 80-G-68536 caption + original-date field (23 May 1943); DANFS narrative (departed 22 May, attacked 'the following morning'); Shipscribe disposition table (loss 23 May 1943, strike 2 Jun 1943); NavSource headline 'Sunk 22 May 1943' vs NavSource's own transcribed NARA caption for 80-G-68537 (23 May 1943); HistoryNet 'Friday, May 22' (day/date internally inconsistent) [other_primary]
- Locator
- NHHC 80-G-68536 caption; DANFS loss narrative; Shipscribe disposition row; NavSource 12/09052.htm headline vs photo caption
- Finding type
- historical_record
- Finding
- CORRECTION: sources split on the loss date. NavSource's headline and timeline carry 'Sunk/Lost ... 22 May 1943', but NHHC's own photo catalog (80-G-68536, original date 23 May 1943), the NARA photo caption transcribed on NavSource itself (80-G-68537, 'on 23 May 1943'), DANFS's narrative (departed Tulagi 22 May, attacked 'the following morning'), and Shipscribe's register-derived disposition (23 May 1943) all support 23 May 1943 as the loss date. This record carries 23 May 1943; the 22 May figure appears to reflect the departure date.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-05
- Limitations
- Corrects a circulating date error, not a material claim. HistoryNet's 'Friday, May 22' is internally inconsistent (22 May 1943 was a Saturday) and appears to conflate the departure date. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-niagara-pg52-13