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| Shinano (battleship) | |
|---|---|
| Ship name | Shinano |
| Caption | Shinano under construction, 1944 |
| Ship country | Empire of Japan |
| Ship namesake | Shinano Province |
| Ship ordered | 1940 |
| Ship builder | Yokosuka Naval Arsenal |
| Ship laid down | 4 May 1940 |
| Ship launched | 8 October 1944 |
| Ship completed | 19 November 1944 |
| Ship fate | Sunk by USS Archerfish (SS-311) on 29 November 1944; wreck located 2001 |
Shinano (battleship) was an Imperial Japanese Navy capital ship begun as an Yamato-class battleship and converted during construction into the largest aircraft carrier of World War II, intended to serve the Imperial Japanese Navy's Combined Fleet as a fleet carrier and mobile armor and flagship. Conceived after the Battle of Midway and amid the Pacific War, Shinano's design, conversion and hurried commissioning reflected Japanese strategic responses to USS Enterprise (CV-6), USS Yorktown (CV-5), and carrier-centric naval doctrine; she was sunk shortly after commissioning by the United States Navy submarine USS Archerfish (SS-311) during transit to Yokosuka.
Shinano's design evolved from the Yamato-class battleship program begun under the Washington Naval Treaty constraints and later the London Naval Treaty withdrawals; planners including officers from the Kantai Kessen school, admirals like Isoroku Yamamoto's contemporaries, and engineers at the Bureau of Naval Affairs debated adapting a third Yamato-class hull. Strategic considerations after Pearl Harbor, Battle of the Coral Sea, and especially the Battle of Midway prompted the Kido Butai's reassessment; proponents argued conversion into a flattop with an armored flight deck would yield a survivable fleet carrier to reinforce damaged units like Zuikaku and Shōkaku. Naval architects at Yokosuka Naval Arsenal and the Bureau of Shipbuilding incorporated lessons from HMS Illustrious, USS Lexington analyses, and German Graf Zeppelin studies while balancing requirements from the Imperial General Headquarters and Navy Ministry.
Laid down as the third Yamato-class hull at Yokosuka Naval Arsenal on 4 May 1940, Shinano's construction reflected industrial capacity constraints faced by Nippon Kokan subcontractors and the Japan Steel Works. After the Midway losses, a decision by the Navy Ministry in late 1942 ordered conversion to a carrier; work involved removing part of the battleship superstructure, installing an armored flight deck inspired by HMS Illustrious and strengthening hangar arrangements used on Soryu and Hiryu. Shipwrights integrated advances from Yamato's armor scheme and lessons from Musashi and worked under oversight from Admirals and engineers associated with Kure Naval Arsenal. Delays caused by bombing raids by United States Army Air Forces and shortages affecting Mitsubishi Heavy Industries prolonged completion; by commissioning on 19 November 1944, Shinano remained incomplete in damage control fittings and crew training drawn from Kure Naval District personnel and aircrew from Yokosuka Naval Air Group.
Shinano's dimensions reflected her origin: an overall length exceeding the Essex-class aircraft carrier and beam comparable to Hōshō and Akagi, with displacement approximating the largest capital ships; designers retained heavy armor plating derived from Yamato's citadel concept including thick armored flight deck and belt armor similar in intent to HMS Illustrious's armored carrier doctrine. Planned air group mixes referenced A6M Zero variants like those flown from Shōkaku and Zuikaku, B6N Tenzan torpedo bombers, and D4Y Suisei dive bombers, although fuel shortages and production bottlenecks at Nakajima and Mitsubishi limited complements. Anti-aircraft armament included multiple 25 mm automatic cannon produced by Japan Steel Works and heavier dual-purpose batteries influenced by Musashi's fittings; radar systems lagged behind United States Navy standards such as the SK radar family, relying on indigenous sets developed by Japan Radio Company and the Electronics Section.
Commissioned into the Combined Fleet under a short period of sea trials, Shinano was slated to reinforce surviving carriers after Battle of the Philippine Sea and provide a hardened carrier escort for task forces including elements of 1st Mobile Fleet and 2nd Fleet. Operational planning involved coordination with air groups from 14th Air Fleet and support from Sasebo Naval District and Yokosuka Naval District units. Her maiden transit from Kure to Yokosuka embedded damage-control crews and supply trains but lacked full complement of watertight subdivision fittings and extensive damage control training seen on veteran ships like Yamato and Musashi; Japanese operational tempo under Admiral Soemu Toyoda contributed to the accelerated schedule.
On 29 November 1944, during the transit to Yokosuka, Shinano was detected and torpedoed by USS Archerfish (SS-311) commanded by Lieutenant Commander Joseph F. Enright. Multiple torpedoes struck amidships and aft, exploiting incomplete compartmentation and immature damage control measures; flooding overwhelmed pumps and crew, and despite efforts by escort destroyers such as Hamana and Yamagumo and damage control parties, Shinano capsized and sank in the Suriya Sea area off Honshu within hours. Loss reports circulated among Combined Fleet staff, provoking inquiries by the Navy Ministry and affecting Japanese morale and strategic carrier availability during subsequent engagements including Battle of Leyte Gulf.
The wreck of Shinano was located in 2001 by a survey led by Paul Tidwell and discovered with assistance from sonar teams and research vessels employing multibeam sonar and ROV technology similar to expeditions that located Bismarck and USS Yorktown (CV-5). Subsequent dives and explorations by submersibles documented hull breaches consistent with wartime torpedo damage; artifacts and structural analysis aided historians and naval engineers at institutions like the Naval War College and Smithsonian Institution in reassessing sinking mechanics, while Japanese scholars from National Institute for Defense Studies contributed archival research linking shipyard records from Yokosuka Naval Arsenal and Kure to the physical evidence.
Shinano's rapid conversion, brief active life, and catastrophic loss have made her a focal point in debates among historians at Naval War College, International Institute for Strategic Studies, and university programs such as University of Tokyo's history departments over interwar naval policy, carrier doctrine, and industrial mobilization. Analysts compare Shinano to HMS Glorious and USS Hornet (CV-8) as cautionary cases in readiness and damage-control training; archival work by researchers drawing on sources from the National Archives of Japan, United States National Archives, and personal papers of officers like those in the Yamamoto family archive continue to refine assessments. Shinano remains emblematic of late-war Japanese strategic improvisation and the accelerating shift to carrier-centered power projection exemplified by engagements at Midway, Philippine Sea, and Leyte Gulf.
Category:Imperial Japanese Navy ships Category:Aircraft carriers of the Imperial Japanese Navy