THUNDERBOLT (N25) 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 1,090 t (1,107 tnes)
- DISPLACEMENT SUBMERGED: 1,575 t (1,600 tnes)
- MACHINERY: Twin Screws, Diesel/Electric
Motors; 2,500/1,450 hp - LENGTH: 265 ft (80.8 m)
- BEAM: 26.5 ft (8 m)
- DRAUGHT: 14.75 ft (4.5 m)
- PERFORMANCE SURFACED: 15.25 knots
- PERFORMANCE SUBMERGED: 9 knots
- ARMAMENT: 10 21in TT; 1 4in gun
- SURFACE RANGE: 3,800 nm (7,041 km)
at 10 knots - CREW: 59
- LAUNCHED: June 29, 1938