S56 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 856 t (870 tnes)
- DISPLACEMENT SUBMERGED: 1,090 t (1,107 tnes)
- MACHINERY: Twin Screws, Diesel/Electric Motors;
4,000/1,100 hp - LENGTH: 255.1 ft (77.5 m)
- BEAM: 21 ft (6.4 m)
- DRAUGHT: 13.23 ft (4.06 m)
- PERFORMANCE SURFACED: 18.75 knots
- PERFORMANCE SUBMERGED: 8.8 knots
- ARMAMENT: 6 533mm TT; 1 100mm gun
- SURFACE RANGE: 9,000 nm (16,677 km)
at 10.5 knots - CREW: 46
- LAUNCHED: December 1939