I-201 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 1,291 t (1,311 tnes)
- DISPLACEMENT SUBMERGED: 1,450 t (1,473 tnes)
- MACHINERY: Two Screws, Diesel/Electric Motors;
2,750/5,000 hp - LENGTH: 259.2 ft (79 m)
- BEAM: 19 ft (5.8 m)
- DRAUGHT: 17.9 ft (5.4 m)
- PERFORMANCE SURFACED: 15.7 knots
- PERFORMANCE SUBMERGED: 19 knots
- ARMAMENT: 4 533mm TT; 2 25mm guns
- SURFACE RANGE: 5,800 nm (10,747 km)
at 14 knots - CREW: 100
- LAUNCHED: 1944