and down the harbour dropping depth charges and talking about enemy subs in the harbour? There's not one to be seen." The crew reiterated that a submarine had been seen, but Muirhead-Gould remained unconvinced and before he left, added sarcastically: "If you see another sub, see if the captain has a black beard. I'd like to meet him." Despite the blackout order, the Garden Island floodlights remained on until 00:25. About five minutes later, M-24 fired the first of its two torpedoes; it delayed firing the second torpedo for several minutes as the midget submarines would lose longitudinal stability immediately after firing a torpedo. Historians are divided as to the exact paths of the torpedoes relative to Chicago, although all agree that the US cruiser was the intended target. Both torpedoes missed Chicago, while one torpedo may have also passed close to Perkins''' starboard bow. One of the torpedoes continued underneath the Dutch submarine K-IX and HMAS Kuttabul, then hit the breakwater Kuttabul was tied up against. The explosion broke Kuttabul in two and sank her, and damaged K-IX. The attack killed 19 Royal Australian Navy and two Royal Navy sailors, and wounded another 10. The explosion shook residences in the area and damaged Garden Island's lights and telecommunications. The other torpedo ran aground on the eastern shore of Garden Island without exploding. M-24 then dived and moved to leave the harbour. A crossing over the indicator loop that was recorded at 01:58 was initially believed to be another midget submarine entering the harbour, although later analysis showed that the reading indicated an outbound vessel and therefore most likely represented M-24s exit. M-24 did not return to its mother submarine, and its fate remained unknown until 2006. Ships were ordered to make for the open ocean. Chicago left her anchorage at 02:14, leaving a sailor behind on the mooring buoy in her haste to depart. Bombay, Whyalla, Canberra, and Perkins began their preparations to depart. Just before 03:00, as Chicago was leaving the harbour, the lookouts spotted a submarine periscope passing alongside the cruiser. At 03:01, the indicator loop registered an inbound signal; M-21 was re-entering Sydney Harbour after recovering from the attack four hours previously. fired on M-21 in Neutral Bay at 03:50, and at 05:00, three auxiliary patrol boats—HMAS Steady Hour, Sea Mist, and Yarroma—spotted the submarine's conning tower in Taylors Bay. The patrol boats had set their