From Dec 1 to 2, 2017, the "Petrel" has conducted a two-day exploration for the World War II battleship USS "Ward" that sank in the waters of Ormoc Bay. The historic warship from the United States fired the first shot against the Japanese during the Pearl Harbor bombing in Hawaii. It was sunk by a kamikaze, or a Japanese suicide pilot, on Dec 7, 1944. There was no update yet on whether the underwater wreckage found included the remains of the USS "Ward". there were three U.S. destroyers, six Japanese destroyers, a Japanese submarine, and many Japanese cargo ship on the sea bed. Six targets in deep water are not accessible by divers and thus not exposed to the risk of salvage. However, there have been other discoveries in these waters, as the "Petrel" explored five shipwrecks in Surigao Strait on Nov 21. These were the sunken battleships of the Imperial Japanese Navy (IJN), possibly "Yamashiro", "Fuso", "Yamagumo", "Michishio" and "Asagumo". Apositive identification of the wrecks of the "Yamagumo" and "Michishio" remained unanswered and will need further study by historians. The "Yamashiro", "Fuso" and "Asagumo" were identifiable based on the class of ship and their geography.