HMAS '' Koala '' was a '' Bar '' - class boom defence vessel operated by the Royal Australian Navy ( RAN ) during World War II . She was constructed by Cockatoo Docks and Engineering Company , Sydney , and launched on 14 November 1939 . The ship served in Darwin during World War II , and received the battle honour " Darwin 1942 – 43 " . She was sold in 1969 and was sunk during the Brisbane floods in 1974
Brisbane floods in 1974
1974 Brisbane flood
HMAS Koala