The Royal Australian Navy pauses to honour those who died in one of the RAN’s most enduring maritime mysteries. On 14 September 1914, one of Australia’s first submarines AE1 was conducting a routine patrol to the east of the Duke of York Island group, near Rabaul, when she vanished. Despite three days of searching, no trace of oil, debris or any of the 32 sailors and three officers on board was found. The loss of AE1 is one of Australia’s worst naval disasters and remains one of its greatest mysteries.