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French submarine Prométhée (Q153)
''Prométhée'' (Q153) was a French ''Redoutable'' class submarine. The submarine sank while on trials near Cap Lévi, off Cherbourg, France, killing 62 men.
== Sinking ==
Eighteen months after her launching, the ''Prométhée'' was still on trials before commissioning. She was commanded by lieutenant de vaisseau Amaury Couespel du Mesnil. On 7 July 1932, the crew and engineers from Cherbourg Navy Yard and Le Creusot ironworks ran trials of the engines on the surface.
About noon, the electrical engines trial was over. the ''Prométhée'' was seven nautical miles north off the Cap Lévi's lighthouse, in Fermanville. The captain ordered to begin the diesel engines trial. At that moment, the ballast tanks flooded without any apparent reason. The submarine sank immediately but was not yet fitted for diving: compressed air tanks were empty so blowing out the ballast was impossible and no oxygen tanks were functional. About 15 people were on the ''Prométhée'' deck, including Couespel du Mesnil. He reported his submarine started to sink by the aft faster and faster, making an angle of 80°. The whole process lasted less than a minute.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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