Four Type 97 Special torpedoes were fired during the Japanese midget submarine raid on Sydney Harbour in the early hours of June 1, 1942. Two were fired by the midget "M-24" and aimed at the American heavy cruiser USS "Chicago", then tied to the No 2. buoy at Garden Island in Sydney Harbour. Both missed. One struck the harbour wall beneath the depot ship HMAS "Kuttabul", sinking the converted ferry and killing 19 Australian and 2 British sailors aboard. The second failed to arm, and ran harmlessly aground at Garden Island.