8 July with an uneventful patrol in the Yellow Sea and lifeguard duty off Shanghai. On 24 July, she bombarded Surveyor Island, off the China coast, in an attempt to destroy an enemy radar station. Shortly after midnight on 11 August, she located a small Japanese cargo ship near her lifeguard station but could not make positive identification at night. The ship was dead in the water, so Spikefish waited until morning, identified it as enemy and sank it with gunfire. Three survivors were brought on board. On the night of 13 August about southeast of Shanghai, she made radar contact with a surfaced submarine. After tracking it for about an hour, the submarine submerged and disappeared from Spikefishs scope. At 00:07, contact was regained and the submarine was tracked until morning, when she was sighted on the surface. Her silhouette proved her to be Japanese. Spikefish fired six torpedoes. Two hit the target, which sank in a cloud of smoke at . The sole survivor who was taken prisoner identified the submarine as I-373; she was the last Japanese submarine sunk in the war. End of War On 15 August, an order was received to cease all attacks, as Japan had agreed to surrender. The submarine delivered her prisoners to Saipan on 21 August and proceeded to Pearl Harbor, On 6 September, she and sailed for the east coast of the United States. Spikefish transited the Panama Canal on 23 September and arrived at New London, Conn. on 29 September. She was in drydock at the Portsmouth Navy Yard from 1 November 1945 to 15 February 1946. Upon her return to New London, her home port, she was assigned to Submarine Squadron 2 and trained personnel of the submarine school. Post War service and fate Her training duty was interrupted by an overhaul from 7 April to 22 September 1947; a cruise to Bermuda from 25 September to 2 October 1947; and another overhaul at Philadelphia Naval Shipyard from 16 May to 8 July 1948. Spikefish operated from New London making training cruises along the east coast from Bermuda to Nova Scotia until 30 April 1955. On that day, she and sailed for the Mediterranean and deployment with the 6th Fleet. Spikefish returned to New London on 8 October 1955 and resumed her normal training duties until early 1963. On 18 March 1960, Spikefish became the first United States