M172 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 206 t (209 tnes)
- DISPLACEMENT SUBMERGED: 218 t (221 tnes)
- MACHINERY: Single Screw, Diesel/Electric Motors;
800/400 hp - LENGTH: 146 ft (44.5 m)
- BEAM: 10.83 ft (3.3 m)
- DRAUGHT: 9.83 ft (3 m)
- PERFORMANCE SURFACED: 14 knots
- PERFORMANCE SUBMERGED: 8 knots
- ARMAMENT: 2 533mm TT; 1 45mm gun
- SURFACE RANGE: 1,880 nm (3,484 km)
at 8 knots - CREW: 20
- LAUNCHED: 1936