her into Sakata. That night, she moved northward again, and, at 0510 on 15 June, she sighted a passenger/cargo ship standing south past the northern end of Oga Hanto. At 0522, she fired a torpedo which hit just forward of amidships. Koan Maru sank in four minutes. Sea Dog cleared the area as small craft from the beach moved out to pick up survivors. On 17 June, Sea Dog rotated areas with Spadefish and Crevalle and headed north to hunt along the Hokkaidō coast between Bakkai and Kamui Misaki. Two days later, she sighted three merchantmen moving northward along the coast and attacked, firing two torpedoes at the lead ship and three at the second. The third ship changed course. Sea Dog turned back to the previous targets. The first ship, cargo ship Kokai Maru, was going under, stern first. But, before she could fire again on the second ship, an enemy plane was sighted. Sea Dog dived. At , she grounded; backed off, cleared and then headed north. The plane did not attack. SS-401 remained in the area for several more days, then headed for Pearl Harbor. On 30 June, she arrived at Midway; and, on 5 July, she entered Pearl Harbor. Fifth War Patrol On 13 August, she departed that port for her fifth war patrol. On 14 August, she received orders to cease hostilities; and, on 15 August, she reversed course for Pearl Harbor.Sea Dog conducted training operations in the Hawaiian Islands during the remainder of August. On 6 September, she headed west with , , and ; and, on 26 September, she arrived at Subic Bay in the Philippine Islands, to join the newly formed postwar squadron, SubRon 5. Post-War Duties For the next three and one-half months, Sea Dog operated out of Subic Bay and, on 12 January 1946, set a course for the West Coast, arriving at San Francisco, California, on 2 February. Overhaul at Mare Island followed; and, in June, she returned to Pearl Harbor to prepare for her second postwar deployment to the Far East. During July, while en route to the Philippines, she conducted a mock war patrol. In August and early September, she provided antisubmarine training services to Seventh Fleet units in the Tsingtao area; and, at the end of the latter month, she returned to Pearl Harbor. Through 1947, Sea Dog remained in the eastern Pacific, conducting training operations