Inside a submarine (HNLMS Tonijn S805)

HNLMS Tonijn (Dutch: Thunnus) was a Potvis-class submarine (modified Dolfijn class) of the Royal Netherlands Navy. Tonijn Builder Wilton-Fijenoord, Schiedam Laid down 26 October 1962 Launched 14 June 1965 Commissioned 24 February 1966 Decommissioned 10 January 1991 Status Museum ship since summer 1994 General characteristics [1] Class and type Dolfijn-class submarine Displacement 1140 tons standard 1509 tons surfaced 1831 tons submerged Length 78.3 m (256 ft 11 in) Beam 7.8 m (25 ft 7 in) Draught 5 m (16 ft 5 in) Propulsion 2 × 1,250 bhp (932 kW) diesel engines 2 × 2,200 bhp (1,641 kW) electric motors Speed 14.5 kn (26.9 km/h; 16.7 mph) surfaced 17 kn (31 km/h; 20 mph) submerged Complement 67 Armament 4 × 21 in (533 mm) bow torpedo tubes 4 × 21 in stern torpedo tubes