Sound: http://audiojungle.net/item/war/12624205?s_phrase=war&s_rank=3 Submarine: were built in the United Kingdom (1936-1939) Tonnage: 570 (in its current condition) Displacement: 665 tons surfaced 853 tons submerged Length: 59.5 m Beam: 7.5 m Draught: 3.6 m Speed: surface – 13.5 knots submerged – 8.5 knots Complement: 4 officers + 28 men Armament: 4 × bow torpedo tubes (8 21” torpedoes) 1 × 40 mm AA gun “Bofors” 1 × .303 (7.7mm) AA gun “Lewis” 20 mines