 Complete the following phrase:  Completing his course at the Flinders Naval Depot, Sheean was posted to the Garden Island naval base HMAS Penguin in Sydney Harbour on 11 May. During his time with Penguin, he was berthed on HMAS Kuttabul, a Sydney ferry requisitioned for use as a barracks ship. Granted a period of leave later that month, he returned home to Tasmania. While he was on leave, Japanese midget submarines 