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46 Tons (surfaced)
47 Tons (submerged)
78.5' x 6' x 10.2'
2 x Type 97 torpedo
140kg scuttling charge
Arnold Nov 12, 2006
Allen December 21, 2017
On May 31, 1942 at 5:40pm I-24 roughly 7.5 miles east of Sydney launched this midget submarine on a mission to attack Allied warships in Sydney Harbor. A total of three midget submarines participated in the attack: M24 (this submarine) plus M22 (launched by I-22) and M27 (launched by I-27).
At 9:50pm, M24 crossed the indicator loop at the entrance to Sydney Harbor unnoticed. At 10:07pm, all vessels in Sydney Harbor were alerted of the presence of an enemy submarine. At 10:50pm M24 was spotted by the crew of the USS Chicago CA-29 which opened fire, together with two Australian ships. This submarine evades them and waited for an hour and a half then resumed her mission.
On June 1, 1942 at 12:30am, M24 fires both of its torpedoes at USS Chicago CA-29, but both missed. One ran aground without exploding, the other hit the sea wall at Garden Island, and the explosion sink HMAS Kuttabul moored nearby and killed 21 aboard.
On November 25, 2006, Australian Defense Minister Brendan Nelson moved to protected the submarine an historic shipwreck under the Australian Historic Shipwrecks Act (1976) with a 500m protected zone around it with monitoring the restricted area with sonar alarms and underwater cameras.
In late May 2007, Australian authorities decided not to salvage the submarine or the remains of the crew. Divers from the Royal Australian Navy did recovered sand from the sea floor nearby to present to the families of the two crew members.
In recent years, limited SCUBA diving has been allowed at the site with permission. During December 2017, divers Liam Allen, Richard Nicholls, Matt Small and Stephen Ho dove and documented the submarine.
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