After a complete overhaul at Pearl Harbor, "Searaven" set course for the Kuril Islands area. Twelve enemy vessels were sunk during this patrol. On 21 September 1944, in a night surface attack, the submarine torpedoed and sank an unescorted Japanese freighter, "Rizan Maru", which had dropped behind her convoy. On the night of 25 September, "Searaven" engaged two trawlers, four large sampans, and four 50-ton sampans. "Searaven" passed down the column of eight sampans and two trawlers, abeam, engaging from one to three at a time at practically point blank range. Those that did not sink on the first pass were given another dose of the same treatment until all were destroyed.