On Fri. 12 Jan 1945 Kaiten submarines launched by Japanese submarines.....

Kaiten submarines launched by Japanese submarines I-36, I-53, I-56, and I-58 struck targets at Ulithi in the Caroline Islands, Palau Islands, Admiralty Islands, and Guam in the Mariana Islands, respectively. The motherships reported 18 sinkings total, but actual damage done was far less and no ship was sunk.