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On the night of 31 May three Japanese midget submarines entered Sydney harbour. One became entangled in the boom net across the harbour, and her occupants blew her up. A second entered the harbour and fired torpedoes at the cruiser USS Chicago. This midget submarine disappeared, its fate a complete mystery until it was discovered by a group of amateur divers off Sydney's northern beaches in November
On the night of 31 May three Japanese midget submarines entered Sydney Harbour in an attempt to destroy allied shipping berthed in the Harbour. The midget submarines were 24 metres long and weighed 46 tonnes. They carried a crew of two men and two torpedoes. Between 5.
Simpson Harbour is in the town of Rabaul, which was a major Japanese military base on the northeast coast of the South Pacific nation. New Zealand Navy Lt. The only submarines involved in fighting around Rabaul were US and Japanese, and both sides have accounted for most, if not all, of their subs in the area, said Gary Oakley, an Australian War Memorial curator and a former submariner. As Rabaul was Japan's major base in the Southwest Pacific for most of the war, most of the submarines in the harbour had been Japanese. Previously known submarine wrecks in the harbour were also Japanese, he said.