對馬海峽
Then assigned to post-war minesweeping operations Serene swept mines in the Yellow Sea, off Korea, during late August and early September. On 7 September, her group became the Sasebo Sweep Group; and, on the 9th "Serene" commenced operations to clear the entrance to Nagasaki. For the remainder of the month, she continued sweeping operations off the west coast of Kyūshū. In October, she assisted in clearing the eastern end of Tsushima Strait; and, in early November, she returned to the waters off Korea to operate off the east coast in the Sea of Japan. At mid-month, she resumed operations in the Tsushima Strait to clear the shallow waters at the western end.