USS Tunny observed a large number of small vessels leaving Malakal Island in the Palau Islands in the morning but did not attack. In the afternoon, she observed the arrival of battleship Musashi and other warships; Tunny fired six bow torpedoes at Musashi but failed to hit her. She endured a 38-depth charge counterattack. Later that night, she caught up with the force and damaged Musashi with another torpedo attack.
