I-400 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 5,233 t (5,316 tnes)
- DISPLACEMENT SUBMERGED: 6,560 t (6,665 tnes)
- MACHINERY: Twin Screws, Diesel/Electric Motors;
7,700/2,400 hp - LENGTH: 380.7 ft (116 m)
- BEAM: 39.3 ft (12 m)
- DRAUGHT: 23 ft (7 m)
- PERFORMANCE SURFACED: 18.7 knots
- PERFORMANCE SUBMERGED: 6.5 knots
- ARMAMENT: 8 533mm TT; 1 140mm guns
- SURFACE RANGE: 37,000 nm (68,561 km)
at 14 knots - CREW: 100
- LAUNCHED: 1944