India classifies this type of a submarine as a "Strategic Strike Nuclear Submarine". She remains the largest warship ever sunk by a submarine. Submarines are styled HM Submarine, also abbreviated "HMS". Fulton then concentrated on developing the torpedo independent of a submarine deployment. The Russians thought it might be a nuclear missile launched from an American submarine. Surcouf was the largest French cruiser submarine. This is a type of telephone repeater used in underwater submarine telecommunications cables. None of the 122 men aboard the Japanese submarine survived. Nuclear fuel in the submarine remains intact. It is said to be a sonar evading stealth submarine. The was the first nuclear-powered submarine. India also possesses a single -class nuclear-powered attack submarine named . Another revolution in submarine warfare came with . Godzilla attacks and destroys a Soviet submarine. The threat evolved by World War I with the development of the submarine, or U-boat.