sinking of a Japanese submarine at , but the submarine′s identity has never been established. Some records identify her as , but I-41 was not among the submarines ordered to take part in the evacuation and apparently was sunk on 18 November 1944 in the Philippine Sea by the destroyer escorts and and aircraft from the escort carrier . never acknowledged Miwa′s order and never arrived at Takao, and there is no evidence that she took part in the evacuation; the destroyer escort probably sank her southwest of Manila on 31 January 1945. Ro-46 completed her evacuation mission successfully, and survived until at least April 1945. The Japanese submarine , not a participant in the evacuation but at Aparri at the time to offload ammunition, is a possible candidate, although a submarine the destroyer escort sank on 7 February 1945 has been identified as Ro-55. During the patrol, Fyfe noted that Batfish sighted a significant number of Japanese aircraft, but that they passed her without attempting an attack, a behavior he attributed to what he presumed was the Japanese pilots being more concerned about the large number of American planes also in the area than with Batfish. On 10 February 1945, Batfish detected approaching aircraft which she identified as a flight of four American fighters accompanying a U.S. Navy PBY Catalina flying boat. She submerged to periscope depth and established radio communications with the flight leader, but then gained sound contact on an approaching torpedo. She went to deep submergence and narrowly avoided the torpedo, which passed overhead. Fyfe assessed it as a probable friendly fire incident, in which the aircraft had mistaken her for a Japanese submarine, one of the fighters had spotted for the PBY by following Batfish down her track, and the PBY had dropped the torpedo. At 19:51 on 11 February 1945, Batfish gained radar contact on a target at a range of , and her radar detector picked up radar signals from it at the same time. At 20:37, when she had closed to a range of , her lookouts identified it as another Japanese submarine. The Japanese submarine then dived suddenly at 20:43. At 21:05, Batfish′s passive sonar detected the Japanese submarine blowing her ballast tanks, and at 21:06 the Japanese vessel surfaced again and resumed her course, apparently unaware of Batfish′s presence. Batfish again gained radar contact and detected the Japanese submarine’s radar