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I-400-class submarine

Class of ship
The I-400-class submarine Imperial Japanese Navy submarines were the largest submarines of World War II and remained the largest ever built until the construction of nuclear ballistic missile submarines in the 1960s. The IJN called this type of... Wikipedia
Built: 18 January 1943–24 July 1945
Complement: 144 officers and men
Cost: 28,861,000 JPY in 1942
Displacement: 5,223 long tons (5,307 t), surfaced; 6,560 long tons (6,670 t), submerged
Length: 122 m (400 ft)
Planned: 18
Speed: 18.7 kn (34.6 km/h; 21.5 mph), surfaced; 6.5 kn (12.0 km/h; 7.5 mph), submerged