The submarine arrived at the Australian War Memorial in Canberra on 28 April 1943, flying the White Ensign and a paying-off pennant. The submarine was originally displayed outside the museum in three separate pieces, but was moved inside in the 1980s due to heavy vandalism; on one occasion in 1966, a group of university students painted it bright yellow in response to The Beatles' song Yellow Submarine. The composite submarine was restored and remains on display inside the Memorial as part of a permanent exhibition on the attack, next to the recovered wheelhouse of HMAS Kuttabul.' The conning tower from M-21 is on display at the Royal Australian Navy Heritage Centre on Garden Island. Leftover material from M-21 was melted down and made into souvenirs following the construction of the combined vessel. M-24 Over the 64 years following the disappearance of M-24 after the attacks, more than 50 people approached the Royal Australian Navy claiming to have found the submarine. All of these claims were found to be false. One early theory about the midget's fate was that it was damaged or destroyed, along with M-21, in or around Taylors Bay, which would account for reports from Steady Hour and Yarroma of multiple submarines during their three-hour attack against M-21. A second theory was that the midget attempted to return to the mother submarines but exhausted its battery power before reaching the Port Hacking recovery point and would therefore be outside and to the south of Sydney Heads. The third theory was that the midget's crew decided to avoid endangering the five larger submarines during the recovery process, and either ran straight out to sea or headed north. A group of seven amateur scuba divers solved the mystery in November 2006, when they found a small submarine sitting upright on the seabed, below sea level and approximately from Bungan Head, off Sydney's Northern Beaches. Commander Shane Moore, the officer responsible for the Royal Australian Navy's heritage collection, confirmed that the wreck was M-24 after viewing footage from multiple dives, along with measurements the group had taken. The wreck had several bullet holes in it, most likely from Chicagos quadruple machine-gun mount. The location of the wreck was kept secret by both the divers and the navy, with Defence Minister Brendan Nelson promising to have the wreck protected as a war grave. The wreck was gazetted on 1 December 2006 as