French submarine Prométhée
Redoutable-class submarine
Prométhée was a Redoutable-class submarine of the French Navy, launched in 1930 at Cherbourg. On 7 July 1932, while sailing on the surface during sea trials, she suddenly sank off Cape Lévi, Manche. 62 of her 69 crew were lost with her, causing an... Wikipedia
Construction started: January 10, 1928
Length: 303′
Launched: October 23, 1930
Speed: 20 knots (37 km/h; 23 mph) (surfaced); 10 knots (19 km/h; 12 mph) (submerged)