USS Chain (ARS-20)

Evidence

16 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-16).

1. [1]research packet bm-packet.md (2 sources cited) [nhhc_danfs]

   Finding type

   vessel_history

   Finding

   Identity packet verdict: VERIFIED

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Evidence ID

   uss-chain-ars20-pkt-bm-packet-md

2. [2]Dictionary of American Naval Fighting Ships, Vol. II (Navy Department, Office of the Chief of Naval Operations, Naval History Division; GPO 1963, reprint with corrections 1969), 'Chain' entry - digitized GPO volume via Internet Archive [nhhc_danfs]

   Locator

   DANFS Vol. II 'Chain' entry, 'C' ship list (between Chahao and Chalcedony); full-text stream archive.org/stream/dictionaryofamer02wash/dictionaryofamer02wash_djvu.txt lines ~13923-13967

   Finding type

   vessel_history

   Finding

   DANFS Vol. II entry for Chain, verbatim: 'Chain (ARS-20) was launched 3 June 1943 by Basalt Rock Co., Napa, Calif.; sponsored by Mrs. P. F. Roach; and commissioned 31 March 1944, Lieutenant Commander F. J. George, USNR, in command. Chain sailed from San Diego 14 May 1944, bound for the Panama Canal, and Trinidad, which she reached 2 June. She towed barge YF-324 to Recife, Brazil, where on 2 July she joined the 4th Fleet for operations as tug and salvage ship from Recife and Bahia, Brazil, until 18 June 1945, when she cleared Recife for Norfolk. Her essential support played an important, if humble, part in enabling the 4th Fleet to carry out its mission of protecting the South Atlantic. After overhaul and training at Norfolk, Chain cleared for Key West 22 September, where she made rendezvous with three Italian submarines. Sailing east, her little convoy was enlarged by four additional Italian submarines at Bermuda, and she arrived at Taranto, Italy with her charges 3 November. Chain returned by way of Palermo, Sicily, where she took barge YF-445 in tow, to Charleston, S.C., arriving 31 December. Chain operated along the east coast towing barges and decommissioned ships until she grounded in Block Island Sound 29 March 1946. Quickly floated by Coast Guard Cutter Dix, Chain's bottom was heavily damaged, and from 3 April until 25 June, she was repaired at New London, Conn. She left New London astern 25 June, steaming to Orange, Tex., where she was decommissioned and placed in reserve 9 November 1946.' Header data: 'ARS-20: dp. 1,478; l. 213'6"; b. 39'; dr. 14'8"; s. 15 k.; cpl. 120; a. 4 40mm.; cl. Diver.' Name entry: 'A series of links or rings, usually of metal, fitted into each other.'

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-26

   Study period

   1942-1946

   Population

   Ship's company (complement 120 per print header)

   Limitations

   Authoritative service history for identity, milestones, and operations through the 1946 decommissioning; the volume was published 1963 and does not cover the AGOR-17 oceanographic career. Live NHHC DANFS page for this ship returned 404 on 2026-09-26 (/danfs/c/chain.html) - the printed GPO volume is cited instead (standing NHHC link-rot issue per BATCH-01). Print entry gives no laid-down date and no award detail; 'launched 3 June 1943' conflicts with NavSource's '3 April 1943' (gaps). Contains no asbestos, insulation, or hazardous-material information.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-01

3. [3]NavSource Online: Service Ship Photo Archive, USNS Chain (T-AGOR-17) ex USS Chain (ARS-20) page 09/37/3720 - milestones, spec block, ribbons, CO roster, photo captions [other_primary]

   Locator

   NavSource ARS-20/T-AGOR-17 page: milestone list, spec block, ribbon precedence, CO roster, photo captions

   Finding type

   vessel_history

   Finding

   NavSource Service Ship Photo Archive page for USNS Chain (T-AGOR-17) ex USS Chain (ARS-20): milestone chain 'Laid down, 21 December 1942, at Basalt Rock Co., Napa, CA; Launched, 3 April 1943; Commissioned USS Chain (ARS-20), 31 March 1944, LCDR. Flavius J. George, USNR, in command; During World War II USS Chain (ARS-20) was assigned to the 4th Fleet in the South Atlantic; Decommissioned, 9 November 1946, at Orange, TX; Laid up in the Atlantic Reserve Fleet, Texas Group, Orange; Reclassified as an Oceanographic Research Ship in April 1967; Assigned to the Military Sea Transportation Service (MSTS) as USNS Chain (T-AGOR-17) and operated for the Woods Hole Oceanographic Institution, Massachusetts; Struck from the Naval Register, 30 December 1977; Final Disposition, scrapped, June 1979.' Spec block: 1,897 t; 213'6" x 39' x 14'8"; 15 kts; complement 7 officers / 113 enlisted; largest boom 10 t; armament two twin 40mm AA mounts + four .50 cal. machine guns; fuel 2,300 Bbls diesel + 2,450 Gals gasoline; propulsion four Cooper Bessemer GSR-8 diesel-electric engines, single Fairbanks Morse main reduction gear, ship's-service generators two 200 kW + one 60 kW diesel-drive 120 V D.C., twin propellers 3,000 shp. Call sign NIZA. Ribbons: American Campaign Medal; WWII Victory Medal. CO roster: LCDR George (31 Mar 44 - ?); LCDR Martin Jr. Verey Gamble (1946 - 9 Nov 46). Photo captions incl. All Hands Nov 1946 underway photo, circa-1960s moored and May 1961 underway photos, and NHHC photo NH 79135 (USNS Chain entering Great Harbor, Woods Hole Passage and Nonamesset Island).

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-26

   Study period

   1942-1979

   Population

   Ship's company 7 officers / 113 enlisted per spec block

   Limitations

   Volunteer-compiled archival page quoting/transcribing Navy sources; milestone chain is consistent with the printed DANFS entry and ShipScribe register data except launch date ('3 April 1943' vs print DANFS/ShipScribe '3 June 1943' - gaps) and the 'April 1967' reclassification line, which ShipScribe's Navy-record ship note shows was the formal AGOR-17 records change of 1 Apr 1967, not the start of oceanographic service (1958-59). Spec data are equipment descriptions only - no asbestos content stated or implied.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-02

4. [4]ShipScribe, DIVER (ARS-5) class page - construction table, disposition table, ship notes, and class header spec block (compiled from official auxiliary-vessel register and Navy records) [other_primary]

   Locator

   ARS-5 class page: construction table ARS-20 row; disposition table ARS-20 row; ship notes ARS-20 (CHAIN) entry; class header spec block and armament table

   Finding type

   vessel_history

   Finding

   ShipScribe USN auxiliary-ships reference, DIVER (ARS-5) class page: construction-table row '20 CHAIN, Ord. 14 Mar 42, Basalt Rock, keel 21 Dec 42, launch 3 Jun 43, commiss. 31 Mar 44'; disposition-table row 'decomm. 9 Nov 46, strike 30 Dec 77, disposal ca Nov 79, fate Sold'; ship note verbatim: 'In USN reserve 1946-58. To MSTS from reserve 1 Jul 58, converted to oceanographic research ship by Bethlehem Steel, Boston, and transferred 13 Nov 59 on loan to Woods Hole Oceanographic Institute. Carried in Navy records as ARS-20 until 1 Apr 67 when reclassified AGOR-17. Navy date of record for scrap sale is 7 Nov 79.' Class data: design Navy ARS-5; 1,478 t light / 1,940 t lim; 213.5' oa, 207.0' wl x 39.0' e x 14.1' lim; complement 96 (1944); 14.8 kt; 3,000 HP; machinery 2 screws, diesel-electric. Class armament table places ARS-20 in the '2-40mmT' fit group for 1944-47.

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-26

   Study period

   1942-1979

   Limitations

   ShipScribe (Stephen S. Roberts) is a compiled reference reproducing official auxiliary-ship register and Navy records - the standard published authority on USN auxiliaries, though not itself a primary document; its launch date (3 Jun 43) matches print DANFS against NavSource's 3 Apr 43. The ship note resolves the 'April 1967' reclassification question (records change 1 Apr 67, after oceanographic service began 1958-59) and gives the Navy scrap-sale date of record 7 Nov 79 (vs WHOI's June 1979 tow-away). Complement 96 (1944) conflicts with DANFS/NavSource 120 (gaps). Contains no asbestos or materials information.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-03

5. [5]ShipScribe, DIVER (ARS-5) class page - class notes (compiled from Auxiliary Vessels Board, General Board, CNO/SecNav correspondence, and BuShips records) [other_primary]

   Locator

   ARS-5 class page, class-notes paragraphs (design origin from AT-64; 5 Aug 41 characteristics changes; 12 Jan/16 Feb 42 program for ARS 19-27; stability and boom-configuration notes)

   Finding type

   historical_record

   Finding

   ShipScribe class notes for the DIVER (ARS-5) class: on 28 Mar 41 BuShips submitted a salvage-vessel design using the hull and propelling machinery of the new NAVAJO (AT-64)-class fleet tugs modified by adding a forecastle and lowering the main deck to reduce freeboard aft; CNO/SecNav approved the characteristics 12 Apr 41 (decompression chamber deleted for deck space); 5 Aug 41 CNO approved BuShips-recommended changes from British war experience - twin screws replacing single screw (to improve scouring of sand/silt around grounded ships, maneuverability, and reduced draft aft), specialization on salvage with the towing engine removed, and a flat-bottomed hull form with fairly full ends to let the ship take the bottom without listing or burying when working a wreck in shoal water; designation changed from Fleet Tugs (ATS) to Salvage Vessels (ARS), BuShips assigning ARS 5-9 in place of ATS 1-5 on 8 Sep 41; on 12 Jan 42 the General Board submitted the maximum-war-effort ship list including 9 more salvage ships (ARS 19-27), which SecNav directed 16 Feb 42; post-completion stability concerns were addressed for later units (ARS 21-27 fitted with wooden hull sheathing) and the aft kingpost/boom arrangement was replaced on later vessels.

   Verification

   verified

   Role

   context

   Documentation level

   class_or_era

   Accessed

   2026-09-26

   Study period

   1941-1944

   Population

   WWII construction trades at Basalt Rock Co., Napa (all 15 class units)

   Limitations

   Class/design-program documentation, not a hull record - establishes that this hull's class was a steel-hulled diesel-electric salvage design derived from the AT-64 fleet-tug plant, built under the 1942 expansion program (contract ordered 14 Mar 42 per the construction table). Supports the design-context statements in asbestos_products_documented (diesel-electric, no boilers; steel hull). Contains no asbestos or insulation-material information.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-04

6. [6]ShipScribe DIVER class page (ARS-5 design and machinery data) consolidated with era diesel/steel-hulled auxiliary construction practice; no ship-level materials document located [other_primary]

   Locator

   ARS-5 class page spec block, class notes, and ARS-20 ship note; inference framed on the documented diesel-electric, steel-hulled design

   Finding type

   asbestos_application

   Finding

   Design-level inference for this hull: a steel-hulled, diesel-electric ARS-5-design salvage vessel (four Cooper Bessemer GSR-8 diesel engines, diesel-drive generator sets, twin screws 3,000 shp - no boilers, no steam lines). For a 1942-44 steel-hulled diesel auxiliary, era-consistent asbestos applications concentrate in diesel exhaust/muffler lagging and flange gaskets, machinery piping gaskets and packing, electrical insulation and arc-resistant sheet (e.g., switchboard backing), accommodation and galley fireproofing/joiner panels, and brake linings on winch/windlass/boom salvage gear (10-ton booms, towing winch). The 1958-59 conversion at Bethlehem Steel's Boston yard (oceanographic outfitting: four laboratories, A-frame, winch suites) and the 1979 scrapping are additional undocumented disturbance endpoints; none of this is verified aboard this hull.

   Verification

   inferred

   Role

   supporting

   Documentation level

   class_or_era

   Accessed

   2026-09-26

   Study period

   1942-1979

   Population

   Construction trades (Basalt Rock Co., Napa, 1942-44); ship's company ~96-120; MSTS/WHOI crews and scientists 1958-75; conversion yard workers (Bethlehem Steel Boston, 1958-59); 1979 scrapping crews

   Limitations

   Class/era inference only - no survey, specification, or material list naming this hull was located; the ARS-5 design/BuShips spec package (RG 19) and the 1958-59 Bethlehem Boston conversion work package that would settle materials are unretrieved archival leads. Establishes no quantities, no present-day presence, no individual exposure, and no causation.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-05

7. [7]Corn, Jacqueline Karnell, and Jennifer Starr, 'Historical perspective on asbestos: Policies and protective measures in World War II shipbuilding,' American Journal of Industrial Medicine 11(3):359-373 (1987) [other_primary]

   Locator

   Abstract and article, AJIM 11(3):359-373

   Finding type

   asbestos_application

   Finding

   Peer-reviewed historical study documents that asbestos was used extensively as a fireproofing and insulating material in U.S. shipbuilding during WWII - the era and program under which this hull was built (contract ordered March 1942, built 1942-44) - and that wartime demand drove unprecedented asbestos utilization in ship construction.

   Verification

   verified

   Role

   context

   Documentation level

   class_or_era

   Accessed

   2026-09-26

   Study period

   1940s era documented; article 1987

   Population

   WWII shipyard workers and ship crews (class context)

   Limitations

   Program/era-level scholarly documentation of asbestos use in WWII shipbuilding generally; does not name this vessel or class and does not establish that asbestos was or is aboard this hull, nor quantity, location, condition, exposure, or causation. The study's emphasis on steam-plant insulation applies only in reduced degree to this diesel-electric design.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-06

8. [8]Woods Hole Oceanographic Institution, Data Library and Archives - 'Chain (1958 to 1979)' ship record page (retrieved via Internet Archive Wayback Machine capture 2024-11-12; live page returned HTTP 504 on 2026-09-26) [museum_official]

   Locator

   WHOI DLA ship record for Chain, narrative + spec block (Wayback timestamp 20241112020011); live URL https://www.dla.whoi.edu/ships/79734d6e-ece3-4466-9ff1-f19ff8595634 returned 504 on three attempts

   Finding type

   historical_record

   Finding

   WHOI Data Library and Archives ship page for Chain (1958 to 1979), verbatim text: 'In 1958, the Military Sea Transportation Service (MSTS), took over the operation of Chain, a Navy salvage vessel, and under an agreement with the Navy, the ship came to Woods Hole. Chain's first nine cruises at WHOI were made with an MSTS crew. In 1959, WHOI assumed operation of the vessel. Chain made a total of 129 scientific cruises, including a cruise that took her around the world in 1970-1971. She traveled some 600,000 miles and was used in every type of ocean science. Long a favorite for her seaworthiness, Chain's last cruise ended in December 1975. In June 1979 the vessel was towed away for scrap.' Spec block: Length 213'; Beam 41'; Displacement 2,100 tons; Draft 16'6"; Range 6,000 mi; Science Complement 26; Crew Complement 29; Dates of Affiliation with WHOI 1958/1979; Builder Basalt Rock Co., Napa, CA; Operator MSTS/WHOI.

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-26

   Study period

   1958-1979

   Population

   MSTS crew (first nine cruises); WHOI crew 29 + science complement 26; 129 cruises 1958-1975

   Limitations

   Operating institution's own archive - authoritative for the WHOI-affiliation period and consistent with ShipScribe's Navy-record note (loan transfer 13 Nov 59, after the MSTS-operated cruises of 1958-59). Spec figures (2,100 t, 16'6" draft, 29+26 complements) describe the research-ship configuration and differ from Navy-era figures (gaps). Contains no asbestos, insulation, or hazardous-material information; a 1958-59 shipyard conversion is an undocumented material-disturbance event.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-07

9. [9]Woods Hole Oceanographic Institution, Ocean Learning Hub multimedia page 'Chain' (photo credit WHOI Archives) [museum_official]

   Locator

   whoi.edu Ocean Learning Hub 'Chain' image page text (retrieved live 2026-09-26)

   Finding type

   historical_record

   Finding

   WHOI institutional page for Chain: 'The U.S. Navy built Chain in the 1940s to rescue, tow, and salvage damaged ships in the Pacific. It came to WHOI in 1958 to support oceanographic research. After the vessel was outfitted with four large science laboratories, coring and trawling wire, and a hydraulic A-frame and winch, Chain logged 600,000 miles for science, including a global circumnavigation in 1970 and 1971. Chain's comfortable working space made it a favorite among oceanographers, including one who called Chain "a particulary sea-kindly and able vessel."' [sic - WHOI's own spelling 'particulary'].

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-26

   Study period

   1958-1979

   Population

   WHOI crews and embarked scientists, 1958-1975

   Limitations

   Institutional page describing the research conversion outfit (four labs, coring/trawling wire, hydraulic A-frame and winch) and career mileage; the 'rescue, tow, and salvage damaged ships in the Pacific' line is loose - the hull's WWII service was the South Atlantic 4th Fleet per DANFS - noted but not material. Contains no asbestos or materials information.

   Atlas source

   true

   Evidence ID

   ev-uss-chain-ars20-08

10. [10]GlobalSecurity.org, 'T-AGOR 17 Chain' page (compiled ship-systems reference reproducing Military Sea Transportation Service program-history text) [reputable_press]

    Locator

    GlobalSecurity T-AGOR-17 page, paragraphs on MSTS oceanographic program and the 17 Nov 1958 in-service event; page last modified 2016-03-11

    Finding type

    historical_record

    Finding

    Compiled reference reproducing MSTS program history: 'On 17 November 1958 USNS Chain (T AGOR 17), the first of the Navy's new oceanographic research ships, was placed in service and served with the Military Sea Transportation Service. The ship embarked 28 oceanographers and scientists from the Woods Hole Oceanographic Institute under the direction of the Office of Naval Research. Commanded by Captain Wallace Olivey, the USNS Chain became the first of a fleet of ships operated by MSTS and MSC for unique missions and services and originally known as the Special Projects Branch, and later redesignated Special Missions.' Same page, MSTS fleet-description text: 'Chain was 210 feet long, has a displacement of 1800 tons and a maximum speed of 14 knots. Capable of working in the North Atlantic in winter, Chain had accommodations for a crew of 40, and 28 scientists. She carried among her oceanographic equipment: a large thermistor winch; three hydrographic winches with 20,000 feet of wire each; one deep-sea winch with 30,000 feet of wire; three small winches; and four laboratories. MSTS had the operational responsibilities for the ship.' Page frames the oceanographic survey fleet as supporting the Navy's nuclear-submarine program.

    Verification

    verified

    Role

    supporting

    Documentation level

    ship_specific

    Accessed

    2026-09-26

    Study period

    1958-1979

    Population

    MSTS crew ~40 + 28 WHOI scientists (1958-59 program)

    Limitations

    Compiled secondary reference (not the underlying MSTS document); its quoted program text is consistent with WHOI archive and ShipScribe on the 1958-59 service start, and is used only for the in-service date, program context, and outfit list. 'Captain Wallace Olivey' spelling unverified against a primary source; program-level framing, no asbestos or materials information.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-09

11. [11]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 to automated fetch, HTTP 403, reconfirmed 2026-09-26; content via product-page description - same limitation as batch-01)

    Finding type

    gov_survey

    Finding

    GAO documented the Navy's asbestos-protection program: standing policy (1975) removed asbestos insulation only when damaged or required for repairs, modified 1979 to selective replacement in high-maintenance areas. This hull's commissioned Navy service ended 1946-11-09 - decades before the policy era - and during 1975-79 it was an inactive/reserve then disposed hull: last cruise ended December 1975, stricken 1977-12-30, towed for scrap June 1979, Navy scrap-sale record 1979-11-07. No Navy asbestos-management record was located or expected for this MSTS-loaned, institution-operated hull; any survey or abatement for the 1958-75 MSTS/WHOI period would be in MSTS/MSC or WHOI records, not the Navy shipyard program GAO reviewed.

    Verification

    verified

    Role

    context

    Documentation level

    context_only

    Accessed

    2026-09-26

    Study period

    1979

    Population

    Navy shipyard workers; asbestos program review

    Limitations

    Program-level documentation, not ship- or class-specific; carried to explain why no Navy asbestos-management-era record exists for this hull (out of Navy commission from 1946; MSTS/WHOI-operated 1958-75; disposed 1979). GAO's scope was Navy shipyard/worker protection, not MSTS civil-service shipping or institutional research vessels. Full-text pull remains an open lead.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-10

12. [12]California Regional Water Quality Control Board, San Francisco Bay Region, Order No. R2-2020-0014 (rescission of SCR Order R2-1990-0147), former Napa Pipe Facility, Napa County; corroborating history: Napa Valley Register coverage of the Napa Pipe site [other_primary]

    Locator

    Order R2-2020-0014 findings 1-5 (site description, COCs, cleanup history); napavalleyregister.com Napa Pipe remediation coverage (site history naming Basalt)

    Finding type

    environmental_record

    Finding

    The builder yard is a documented hazardous-substance cleanup site: California Regional Water Quality Control Board, San Francisco Bay Region, Order No. R2-2020-0014 (rescinding Site Cleanup Requirements Order R2-1990-0147) for the former Napa Pipe facility, 1025 Kaiser Road, Napa - the same 150-acre site on the east bank of the Napa River where 'industrial uses began at the site in the 1930s, including shipbuilding and manufacturing of steel'; contemporaneous press (Napa Valley Register) confirms 'Basalt built World War II ships there in the 1940s,' i.e., the Basalt Rock Co. yard that built this hull. The order documents contaminants of concern in soil and groundwater: total petroleum hydrocarbons (diesel and motor-oil/hydraulic-oil range), volatile organic compounds, and localized elevated metals; ~122,000 cubic yards of contaminated soil excavated under the cleanup program before residential-scale brownfield redevelopment.

    Verification

    verified

    Role

    context

    Documentation level

    context_only

    Accessed

    2026-09-26

    Study period

    1930s-2020 (site operations to 2005; cleanup orders 1990-2020)

    Population

    Napa Pipe/Basalt Rock site and neighborhood (remediation context)

    Limitations

    Builder-yard environmental record only - documents soil/groundwater contamination and state-lead cleanup at the site of the yard that built this hull (1942-44); the order does not itemize asbestos among contaminants of concern and no asbestos-specific listing was located for the site. Establishes nothing about materials aboard the vessel; no vessel attribution intended or implied.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-11

13. [13]CourtListener API v4 search (via cl-auth-search.py): 'USS Chain' type=o 1 hit (collision); 'ARS-20' type=o 2 hits (collisions); 'USNS Chain' type=o 0; 'T-AGOR-17' type=o 0; 'Basalt Rock'+asbestos type=o 0; 'USS Chain' type=r 0; 'ARS-20' type=r 100 (collisions); 'ARS 20' variant pending fleet pacing (2026-09-26) [court_record]

    Locator

    search_ledger rows sl-uss-chain-ars20-07 through -13; collision review of 'ARS-20' docket result set (top ~20 by relevance, all ARS-named-defendant collection cases)

    Finding type

    litigation_documented

    Finding

    CourtListener sweep (authenticated API v4 via cl-auth-search.py, 2026-09-26): opinion index - 'USS Chain' count 1 (Standard Oil Co. v. Anglo-Mexican Petroleum Corp., 112 F. Supp. 630, S.D.N.Y. 1953 - an admiralty collision case matching on the word 'chain,' a name collision, not this vessel); 'ARS-20' count 2 (Cal Fire Local 2881 v. CalPERS; Swinerton Builders Northwest - code/statute-string collisions, not the hull); 'USNS Chain' count 0; 'T-AGOR-17' count 0; 'Basalt Rock' asbestos count 0. Docket index - 'USS Chain' count 0; 'ARS-20' count 100 with all reviewed results being consumer-credit/collection dockets against entities named 'ARS' (Account Resolution Services, Asset Recovery Solutions, ARS National Services, etc.) - name collisions, not litigation naming the vessel. No qualifying asbestos litigation naming this hull was located. The spaced-variant 'ARS 20' opinion sweep was not completed before the fleet pacing budget closed (helper exit 2) - documented residual coverage gap, not clearance.

    Verification

    partial

    Role

    negative_finding

    Documentation level

    ship_specific

    Accessed

    2026-09-26

    Study period

    2026-09-26

    Limitations

    Coverage note: opinion and docket indexes cleared for the ship's exact name and hull numbers; the single 'USS Chain' opinion hit and all ~100 'ARS-20' docket hits are text-level name collisions, not vessel references - classified down accordingly. The spaced-variant 'ARS 20' sweep (a common MDL-875 vessel-list format) remained queued behind fleet pacing at write time - residual coverage gap, not clearance. Even a completed sweep shows only absence of located litigation, not absence of exposure.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-12

14. [14]Batch-2656 search ledger (this record): DANFS Vol. II print scan via Internet Archive; NavSource 09/37/3720; ShipScribe ARS-5 class page; WHOI DLA (Wayback) and whoi.edu; GlobalSecurity T-AGOR-17; MARAD ShipHistory; NARA deck-log index; NVR; CA Water Board Order R2-2020-0014; CourtListener; shipyards.json [other_primary]

    Locator

    search_ledger rows sl-uss-chain-ars20-01 through -21

    Finding type

    historical_record

    Finding

    No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or adjudicated case naming this hull (USS Chain ARS-20 / USNS Chain T-AGOR-17) was found in the public sources searched - the printed DANFS entry, NavSource, ShipScribe, WHOI institutional and archive pages, the GlobalSecurity-compiled MSTS program text, MARAD ShipHistory (no card), the NARA online deck-log index, the Naval Vessel Register (pre-1987 disposal, absent), and CourtListener contain no asbestos or insulation-material statement for this hull (see search_ledger).

    Verification

    verified

    Role

    negative_finding

    Documentation level

    ship_specific

    Accessed

    2026-09-26

    Study period

    2026-09-26

    Limitations

    Absence of a located public record does not prove absence of asbestos aboard - a 1942-44 diesel-electric auxiliary is era-consistent with asbestos-containing gaskets, packing, exhaust lagging, electrical insulation, accommodation fireproofing, and brake linings even though its diesel plant narrows the footprint relative to steamships, and the 1958-59 Bethlehem Boston conversion and 1979 scrapping are undocumented disturbance endpoints. Does not establish presence or absence; does not establish or defeat any claim of exposure or legal eligibility.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-13

15. [15]NARA record-group framework (RG 24 deck logs, RG 38 war diaries, RG 19 BuShips records); NHHC numerical photo series (NH 79135) per NavSource caption; MSTS/MSC program records; WHOI Data Library and Archives ship files; NARA online deck-log index (archives.gov/research/military/logbooks/navy-online) checked for Chain/ARS-20 - absent [other_primary]

    Locator

    NARA digitized deck-log index, 'C' ship list (no Chain/ARS-20 listed; index covers selected hulls by year); NavSource photo caption for NH 79135; WHOI DLA ship index entry 'Chain (1958 to 1979)'

    Finding type

    historical_record

    Finding

    Archival leads confirmed at series level, unretrieved: NHHC still photo NH 79135 (USNS Chain entering Great Harbor, Woods Hole Passage and Nonamesset Island - credited U.S. Navy/NHHC via NavSource caption; NHHC numerical online-image pages return 404 under the current site); NARA RG 24 Entry 118 deck logs for ARS-20 (Mar 1944-Nov 1946 commission; the NARA online deck-log index lists no Chain/ARS-20 - physical holding only, digitization unverified); NARA RG 38 WWII war diaries for ARS-20 (microfilm series, digitization unverified); BuShips RG 19 records for the ARS-5 design package and Basalt Rock construction files - the specification set that would carry any materials/insulation list; MSTS/MSC and ONR records for the 1958-59 Bethlehem Steel Boston conversion work package (likeliest material-disturbance documentation); WHOI Data Library and Archives ship files and cruise records for Chain (1958-1979) - the operating institution's own archive, whose summary page was retrievable only via Wayback at write time (live 504).

    Verification

    partial

    Role

    archival_lead

    Documentation level

    ship_specific

    Accessed

    2026-09-26

    Study period

    1942-1979 records

    Limitations

    Archival lead, not an asbestos finding: deck-log, design-record, and conversion-record existence is asserted at series level; no hull-specific NAID was retrieved. Deck logs, the ARS-5 spec package, and the Bethlehem Boston conversion work package would document operations and specified materials - whether any asbestos-specific document exists for this hull is unknown until surveyed.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-14

16. [16]Cross-source reconciliation: DANFS Vol. II print scan vs NavSource milestones/specs vs ShipScribe construction/disposition/Navy-record ship note vs WHOI DLA and whoi.edu vs GlobalSecurity-compiled MSTS text vs HyperWar class listing vs NavalCoverMuseum listing vs Wikipedia [other_primary]

    Locator

    DANFS Vol. II 'Chain' entry; NavSource 09/37/3720; ShipScribe ARS-5 page (ARS-20 rows + ship note); WHOI DLA Chain page (Wayback 20241112020011); whoi.edu Chain page; GlobalSecurity tagor-17.htm; ibiblio.org/hyperwar/USN/ships/ships-ar.html Diver-class block; navalcovermuseum.org CHAIN ARS 20 page; Wikipedia USS Chain (ARS-20)/USNS Chain (T-AGOR-17) articles

    Finding type

    historical_record

    Finding

    Source discrepancies mapped: (a) Launch date - print DANFS 'launched 3 June 1943' and ShipScribe construction table '3 Jun 43' vs NavSource '3 April 1943' (Wikipedia repeats the NavSource date in its infobox and the DANFS date in its article text - internally inconsistent); DANFS+ShipScribe preferred, 1943-06-03 carried. (b) Reclassification - NavSource 'reclassified as an Oceanographic Research Ship in April 1967' vs ShipScribe ship note 'carried in Navy records as ARS-20 until 1 Apr 67 when reclassified AGOR-17' vs WHOI/MSTS-documented oceanographic service from 1958-59; resolved: the 1 Apr 1967 event was the formal records reclassification, service began 1958-59. (c) Complement - 120 (print DANFS header; HyperWar class listing; NavSource 7+113) vs 96 (ShipScribe '1944'); research era 40+28 (MSTS program text) and 29+26 (WHOI). (d) Displacement/draft - 1,478 t lt / 1,940 t lim, 14.1' lim (ShipScribe, matching DANFS 1,478 and 14'8") vs 1,897 t, 14'8" (NavSource) vs 1,630 t, 13' (HyperWar listing) vs ~1,800 t (MSTS program text) vs 2,100 t, 16'6" (WHOI research configuration). (e) Disposal - 'towed away for scrap June 1979' (WHOI) / 'scrapped, June 1979' (NavSource) vs 'Navy date of record for scrap sale is 7 Nov 79' (ShipScribe) - read as June 1979 tow-away with November 1979 sale-of-record. (f) Ribbons - American Campaign + WWII Victory (NavSource) vs same plus Europe-Africa-Middle East Campaign Medal (NavalCoverMuseum compiled listing - plausible given the documented 1945 Taranto convoy, but unverified against a primary award source). (g) Armament - '4 40mm' (DANFS) / 'two twin 40mm + four .50 cal' (NavSource) / '2x2 40mm, 5 20mm' (HyperWar listing) / '2-40mmT' group fit 1944-47 (ShipScribe) - the 40mm fit is consistent (two twin mounts); the light-gun component differs between compiled sources. (h) WHOI page describes WWII service as 'rescue, tow, and salvage damaged ships in the Pacific' - the documented theater was the South Atlantic 4th Fleet (DANFS); institutional shorthand, not carried as history.

    Verification

    verified

    Role

    correction

    Documentation level

    ship_specific

    Accessed

    2026-09-26

    Study period

    1942-1979

    Limitations

    Correction row reconciling publication-level discrepancies; print DANFS is preferred for WWII-era service dates and ShipScribe's Navy-record ship note for records events (1 Apr 67 reclassification; 7 Nov 79 scrap-sale), with both sides of each conflict documented rather than resolved by assertion. No asbestos content in any reconciled source.

    Atlas source

    true

    Evidence ID

    ev-uss-chain-ars20-15