Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
-
[1]research packet 934-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-pc-750-pc750-pkt-934-packet-md
-
[2]DANFS, combined volume SC-701 - SC-800 (v1), capsule entry for SC-750 (Naval History and Heritage Command) [nhhc_danfs]
- Locator
- SC-750 capsule within the alphabetical SC-701 - SC-800 DANFS volume page
- Finding type
- vessel_history
- Finding
- DANFS documents for this hull: 'SC-750 - Built at Quincy Adams Yacht Yard Inc., Quincy ,Mass. Keel laid 6/15/42. Launched 9/26/42. Commissioned 11/12/42. Transferred to the Philippines 7/2/48.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Quincy Adams Yacht Yard construction trades (1942); crew (1942-48)
- Limitations
- Ship-specific construction and disposal milestones only; no asbestos or material content, no service narrative, no reclassification, decommissioning, or striking note (capsule entries in this volume carry construction + disposal only). Transfer date reads 7/2/48 (2 July 1948); NavSource carries June 1948 - unresolved conflict noted in gaps. DANFS does not mention that she was commissioned under the designation PC-750 (see ev-08).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-01
-
[3]NavSource Online: Submarine Chaser Photo Archive, SC-750 (ex-PC-750) - milestones, specifications, designation history, Philippine transfer and fate [other_primary]
- Locator
- NavSource 12/150750.htm header block, specifications block, Manila photo caption (National Archives photo credit)
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 15 June 1942 by the Quincy Adams Yacht Yard Inc., Quincy, MA; launched 26 September 1942; commissioned USS PC-750, 12 November 1942; reclassified SC-750 in April 1943; transferred to the Philippines in June 1948 and named Isabella (P 18); scrapped. Header line 'SC-750 served the Navies of the United States and the Philippines'; call sign Nan - Xray - Nan - Mike. Hull spec block: displacement 148 t.; length 110'10"; beam 17'; draft 6'6"; speed 15.6 kts.; complement 28; armament one 40mm mount, two .50 cal. machine guns, two depth charge projector 'Y Guns,' and two depth charge tracks; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. A National Archives-captioned photograph shows SC-750 at Manila, P.I. alongside SC-1267, SC-982, and SC-769: 'Aboard these American submarine chasers at Manila, P.I., Filipinos train and learn the fundamental operations of small craft. With U.S. Navy crewmen as instructors, the Philippine Off-Shore Patrol is learnig [sic] to function as a Navy unit.' - documenting the pre-transfer training context.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948 (US service); 1948- (Philippine service, end undated)
- Population
- Quincy Adams Yacht Yard construction trades (1942); crew ~28 (1942-48); Philippine Off-Shore Patrol/Navy trainees and crews (1948 onward)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestones generally track DANFS/Ships' Data but conflict with DANFS on the Philippine transfer timing (June vs 2 July 1948 - see gaps). Spec block conflicts with the NHHC-era class table on displacement, speed, complement, and armament (see gaps). Contains no asbestos content. NavSource's note 'There is no DANFS history available for SC-750' refers to a standalone vessel entry - a capsule entry does exist in the combined SC-701 - SC-800 DANFS volume (ev-01).
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-02
-
[4]uboat.net Allied Warships, USS SC-750 (SC-750) - construction data and order-of-battle listings for Operations Oboe VI and Oboe II [other_primary]
- Locator
- uboat.net ship page 8967 - 'Notable events involving SC-750' entries 10 Jun 1945 (TU 78.1.42) and 1 Jul 1945 (TG 78.2.7)
- Finding type
- historical_record
- Finding
- Secondary order-of-battle compilation places this hull (Lt. (jg) F. C. Cuthbertson, USNR, commanding) in the two closing Borneo amphibious operations of the war: Operation Oboe VI, the Allied landings at Brunei, 10 June 1945 - SC-750 formed Task Unit 78.1.42, Control Unit 'Green,' together with USS SC-741, within Task Group 78.1 (Brunei Attack Group, Rear Admiral F. B. Royal); and Operation Oboe II, the Allied landings at Balikpapan, 1 July 1945 - SC-750 listed in Task Group 78.2.7, the Control Unit under Cdr. A. J. Petersen, USNR, with USS PC-1134, USS PC-610, USS SC-698, and USS SC-747. The page also records the contract order date 16 February 1942 and the transfer to the Philippines on 2 July 1948, renamed Isabella.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1945
- Population
- Crew under Lt. (jg) F. C. Cuthbertson, USNR (June-July 1945)
- Limitations
- Secondary compilation (uboat.net Allied Warships), transcribing official action-report orders of battle, not the primary action reports themselves - not independently verified against the Seventh Amphibious Force action report for these operations; carried as a service-assignment record at partial verification. SC-750 is absent from NHHC's 'U.S. Pacific Fleet Organization, 1 May 1945' table (checked this session) despite these June-July operations - the table is a snapshot and does not list every locally assigned craft. Control-unit duty (marking boat lanes for assault waves) is consistent with the documented SC-type employment. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-03
-
[5]NARA, Special List #44 - List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (by ship number); RG 24 logbooks [other_primary]
- Locator
- sl-44-ship-number.pdf, ship-number sequence, entry 'SC-750 11/12/1942 6/30/1945' (no PC-750 entry in the PC- sequence)
- Finding type
- historical_record
- Finding
- NARA Special List #44 indexes SC-750's logbooks with coverage 11/12/1942 - 6/30/1945 - a single logbook entry beginning at her commissioning date. No PC-750 entry exists in the index: her logs are filed under SC-750 even for the November 1942 - April 1943 window when she was still designated PC-750. The logs are the authoritative source for her operational movements, but they are textual holdings at the National Archives - not digitized in the Catalog's Logbooks of U.S. Navy Ships and Stations series (catalog search JS-rendered and unfetchable this session; NARA's digitized deck-log coverage does not extend to SC-class WWII hulls).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1945 (log coverage)
- Population
- Crew (November 1942 - June 1945 logging window)
- Limitations
- Archival lead only: logbook existence and date coverage confirmed from the SL-44 index; contents not examined - the logs are not digitized and would require an Archives II (College Park) pull. Log-coverage dates are not commissioning/decommissioning dates. Coverage ends 6/30/1945 while she remained in US service until the July 1948 transfer - the same accession boundary seen across this index's SC entries; whether post-June-1945 logs exist in other NARA accessions is undetermined. Deck logs document movements and availabilities but rarely record hull materials directly.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-04
-
[6]Era inference built on: DANFS/NavSource-documented propulsion for this hull (2 x GM 8-268A diesel engines, wooden hull, no steam plant); NHHC 'Ships of the U.S. Navy, 1940-1945' SC class tables (HyperWar transcription); NavSource SC-497 class index [other_primary]
- Locator
- NavSource spec block (2 x GM 8-268A diesels, wooden-hulled SC type); NHHC SC class table (diesel engines, twin screws); NavSource 12/15idx.htm class index
- Finding type
- asbestos_application
- Finding
- A 110-foot wooden-hulled diesel-driven submarine chaser built in 1942 sits inside the Navy's documented asbestos-use era, but its asbestos-relevant systems are materially narrower than a steam vessel's: with no boilers or steam distribution, the dominant lagged-steam-pipe exposure pathway does not apply. Era-standard asbestos applications plausible aboard a diesel craft of this type and period are limited to thermal insulation/lagging on diesel exhaust trunks and silencers, engine and exhaust-manifold gaskets, valve and flange packing, and electrical insulation/wiring - in a small, largely open-deck craft with a complement of ~28.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- Quincy Adams Yacht Yard construction trades (1942); engine-room crew (1942-48); Philippine Navy crews (1948 onward)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, construction specification, or work package located for SC-750/PC-750. Names era-plausible applications, not confirmed installed materials; asbestos may have been minimal aboard this hull type. No quantity. No manufacturer attribution.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-05
-
[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 that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire construction (1942) and US service era (1942-48).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- 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. GAO's scope is the Navy's shipboard insulation program generally - it does not distinguish wooden-hulled diesel small craft from steam combatants, and does not establish that asbestos was installed aboard this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, consistent with prior batches) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-06
-
[8]Batch-8124 search ledger (this record): DANFS combined-volume entry; NavSource; NARA Special List #44; NHHC Pacific Fleet organization 1945-05-01 (negative check); uboat.net Allied Warships OOB; MARAD Vessel History Database; NVR; CourtListener (status noted); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-pc-750-pc750-01 through -11
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or litigation naming SC-750, PC-750, or the Philippine Isabella (P 18) was found in the public sources searched (see search_ledger). MARAD's Vessel History Database holds no vessel-status card for this hull (name search 'SC-750' returned 'No results' - she transferred directly to a foreign navy without NDRF custody). NVR carries no entry - the hull was disposed in 1948, decades before NVR coverage. The only 'asbestos aboard' material in secondary sources is law-firm/marketing content asserting era asbestos use without primary sourcing - excluded by source policy.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - era materials plausibly present are listed in ev-05 as inference only. CourtListener base searches were attempted and blocked this session (fleet pacing budget), so the litigation record is an open gap, not a negative result. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-07
-
[9]Designation cross-check: NavSource header line ('SC-750, ex-PC-750') and reclassification note ('Commissioned USS PC-750, 12 November 1942; Reclassified SC-750 in April 1943'); DANFS capsule (SC-750 only); NARA SL-44 (logs filed under SC-750, no PC-750 entry); NavSource submarine-chaser index narrative on the PC/SC type-symbol split [other_primary]
- Locator
- NavSource 12/150750.htm header ('ex-PC-750') and milestone block; NARA SL-44 ship-number sequence (SC-750, no PC-750 entry); DANFS SC-701 - SC-800 volume
- Finding type
- historical_record
- Finding
- CORRECTION: the record slug 'uss-pc-750-pc750' implies a PC-461-class steel patrol craft; the hull was in fact a 110-foot wooden-hulled SC-497-class submarine chaser. Unlike sisters whose PC numbers were contract designations shed before commissioning (e.g., SC-729), this hull was actually commissioned under the PC designation - USS PC-750, 12 November 1942 - and served under it for roughly five months until reclassified SC-750 in April 1943, when the Navy split the shared PC/SC number series, retaining PC for the 173-foot steel craft and assigning SC to the 110-foot wooden type. DANFS knows her only as SC-750; her logbooks are filed under SC-750 with no PC-750 index entry.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1943
- Limitations
- Corrects the designation/class implied by the record slug, not a material claim. NavSource's 'Reclassified SC-750 in April 1943' wording is followed for the reclassification timing; DANFS does not mention the PC-750 commissioning designation at all. The underlying 1943 type-symbol split is documented in NavSource's class-index narrative, a secondary compilation.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-750-pc750-08