UNBROKEN (P42) 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 545 t (554 tnes)
- DISPLACEMENT SUBMERGED: 740 t (752 tnes)
- MACHINERY: Twin Screws, Diesel/Electric
Motors; 825/615 hp - LENGTH: 180 ft (54.9 m)
- BEAM: 16 ft (4.8 m)
- DRAUGHT: 12.75 ft (3.8 m)
- PERFORMANCE SURFACED: 11.25 knots
- PERFORMANCE SUBMERGED: 9 knots
- ARMAMENT: 4 21in TT; 1 3in gun
- SURFACE RANGE: 3,800 nm (7,041 km)
- CREW: 31
- LAUNCHED: November 4, 1941