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| Shinano (1944) | |
|---|---|
| Shipname | Shinano |
| Namesake | Shinano Province |
| Builder | Kawasaki Heavy Industries (Kobe) |
| Laid down | 4 November 1940 |
| Launched | 8 October 1944 |
| Completed | 19 November 1944 |
| Fate | Sunk by USS Archerfish (SS-311) on 29 November 1944 |
| Class | Converted Yamato-class battleship hull |
| Displacement | 64,000 long tons (full load) |
| Length | 265 m |
| Beam | 38.9 m |
| Draft | 10.86 m |
| Propulsion | Steam turbines; geared; oil-fired boilers |
| Speed | 27 knots (designed) |
| Range | 7,000 nmi at 18 knots |
| Complement | ~2,300 officers and crew |
Shinano (1944) was a Japanese aircraft carrier completed late in World War II from an unfinished Yamato-class battleship hull. Intended as a fleet carrier to bolster the Imperial Japanese Navy after losses at Battle of Midway, she combined heavy armor and large displacement with abbreviated carrier facilities; she entered service days before her loss. Shinano's rapid commissioning, limited crew training, and inadequate damage control contributed to her sinking on her maiden voyage by the United States Navy submarine USS Archerfish (SS-311), marking one of the largest warship sinkings by submarine action.
Shinano began as the third hull of the Yamato-class battleship program laid down at the Kobe Shipyard of Kawasaki Heavy Industries on 4 November 1940 amid Japanese rearmament during the Second Sino-Japanese War and rising tensions with the United States Navy, Royal Navy, and Imperial German Navy-aligned strategies. The hull benefitted from lessons of Battle of Leyte Gulf, Battle of Midway, and carrier actions that emphasized air power over big-gun engagements. As construction progressed she featured the heavy armor belt and massive displacement characteristic of Yamato-class battleships, including extensive artillery magazines originally intended for 18.1-inch guns and armored citadel protection inspired by Battleship Yamato and Musashi (1942). Industrial constraints and shifting priorities during Pacific War attrition influenced Kawasaki’s yard work and material allocations under directives from the Imperial Japanese Navy General Staff.
Following catastrophic carrier losses at Battle of Midway and mounting aircraft carrier attrition, the Imperial Japanese Navy ordered conversion of the incomplete third Yamato hull into a large fleet carrier to create a fast, survivable platform capable of operating with remaining carrier forces such as Shōkaku-class aircraft carriers and Taihō. Conversion plans were overseen by Admiral Isoroku Yamamoto's successors and naval architects influenced by Admiral Jisaburō Ozawa’s carrier doctrine. The conversion involved removing main-gun turrets, constructing a full-length flight deck with an armored hangar deck, and installing aviation facilities adapted from Hiryū (1939) and Akagi concepts. Despite the redesign, compromises remained: flight deck length, number of catapults, and hangar elevators were reduced relative to purpose-built carriers like Essex-class aircraft carriers to accommodate heavy armor and the existing hull form.
Shinano carried a mixed battery intended for fleet air defense and self-protection. Her anti-aircraft suite included multiple 25 mm Type 96 guns in single, twin, and triple mounts inspired by systems on Aircraft carrier Taihō and Musashi (1942), augmented by heavy dual-purpose guns transferred from the battleship design. Fire-control and sensor systems drew on Japanese radar and optical directors then being fitted to capital ships, paralleling installations on Yamato (1941) and Fuso-class battleship conversions. Aviation facilities accommodated a large air group of Aichi B7A and Mitsubishi A6M aircraft in concept, but shortages of trained aircrews and carrier equipment limited embarked squadrons. Damage-control fittings and compartmentalization reflected battleship standards but were incompletely implemented and inadequately tested before commissioning.
Shinano's service life lasted only days. Commissioned on 19 November 1944 after hurried trials at Kobe and post-conversion work at Kure Naval Arsenal, she was assigned to Combined Fleet command amidst plans to reinforce carrier forces countering United States Third Fleet and United States Fifth Fleet operations supporting Philippines campaign (1944–45) and Battle of Leyte Gulf aftermath. Under the command structure influenced by senior officers from Yamato and Musashi (1942), Shinano departed for Sasebo and sailed for Yokosuka on a transfer voyage intended to complete fitting-out. Crew shortages and inexperienced damage-control parties—issues also encountered aboard vessels like Taihō—hindered operational readiness. During transit she encountered escort destroyers and was shadowed by U.S. submarine patrols deployed from Submarine Force, U.S. Pacific Fleet bases.
On 29 November 1944, the United States Navy submarine USS Archerfish (SS-311) under Commander Joseph F. Enright intercepted Shinano in the Bungo Strait transit region after intelligence and patrol routing linked her movement to Japanese repair facilities. Archerfish launched a torpedo spread that struck Shinano multiple times, penetrating hull sections near engineering spaces and magazines. Progressive flooding, compounded by slow or ineffective sealing of watertight doors and compromised damage-control efforts reminiscent of earlier losses like Taihō and Hiryū (1939), overwhelmed her subdivision. Despite escort attempts by Japanese destroyers and cruiser assets mobilized for rescue, Shinano capsized and sank, taking thousands of crewmen with her and representing one of the largest warship sinkings by a submarine in naval history.
Shinano's loss had tactical and strategic resonance for the Imperial Japanese Navy and naval planners worldwide. Analyses by postwar commissions and naval historians compared her fate to lessons learned from Battle of Midway, Battle of the Philippine Sea, and carrier design trade-offs embodied in Essex-class aircraft carrier and Illustrious-class aircraft carrier developments. The wreck remained undiscovered for decades until deep-submergence exploration by modern oceanographic and wreck-hunting teams using ROV technology located and surveyed the site, confirming hull features and torpedo damage consistent with USS Archerfish (SS-311)'s action. Artifact recovery and site mapping engaged institutions and researchers with interests in maritime archaeology and 20th-century naval history; findings informed studies of wartime shipbuilding, damage-control doctrine, and the human cost of late-war Pacific operations.
Category:Aircraft carriers of the Imperial Japanese Navy Category:World War II shipwrecks in the Pacific Ocean