After discovering USS "Indianapolis", "Petrel" sailed to Surigao City in October 2017 to participate in the 73rd commemoration of the Battle of Surigao Strait. In November 2017, after getting the nod from the Philippines' National Museum, "Petrel" surveyed Surigao Strait and discovered the wrecks of the Japanese battleships , , and the destroyers , , and . Each one was investigated by the ship's ROV and an onboard local historian confirmed the identity of the wreck.