Japanese Subs Infiltrate Sydney Harbour

On the night of May 31, 1942, the Japanese Navy attacked Sydney Harbour with three Ko-hyoteki two-man submarines â?? the first time in history that the city had come under attack. The subs were detected and attacked, causing two of the crews to scuttle their ships and commit suicide. The third sub, in an attempt to sink the USS Chicago, instead sank the HMAS Kuttabul, killing 21 sailors. The sub escaped the harbor but was later found wrecked off of Sydney's northern beaches.