Japanese losses Earnings_and_losses were light : 29 aircraft and five midget submarines lost Earnings_and_losses , and 64 servicemen killed Killing .

A South Korean-led official investigation Criminal_investigation carried out Action by a team of international experts from South Korea , the United States , the United Kingdom , Canada , Australia , and Sweden presented Presence a summary of its investigation Criminal_investigation on 20 May 2010 , concluding that the warship had been sunk Motion by a North Korean torpedo fired by a midget submarine .

On the night of 31 May – 1 June , three `` Ko-hyoteki '' -class midget submarines , each with a two-member crew , entered Arriving Sydney Harbour , avoided Preventing_or_letting the partially constructed Sydney Harbour anti-submarine boom net Earnings_and_losses , and attempted to sink Motion_directional Allied warships .

Two of the midget submarines were detected Know and attacked Attack before they could successfully engage any Allied vessels , and the crews scuttled Destroying their submarines and killed Killing themselves .

This midget submarine 's fate was unknown until 2006 , when amateur scuba divers discovered Know the wreck off Sydney 's northern beaches .

Immediately following the raid Military_operation , the five Japanese fleet submarines that carried Carry_goods the midget submarines to Australia embarked Process_start on a campaign Military_operation to disrupt Hindering merchant shipping in eastern Australian waters .

The midget submarine attacks Attack and subsequent bombardments Attack are among the best-known examples of Axis naval activity Hostile_encounter in Australian waters during World War II , and are the only occasion in history when either city has come Arriving under attack Attack .

During the salvage and removal of the wrecks from West Loch , the U.S. Navy found Know remains of a Japanese midget submarine .

Researchers now believe Know this to be the fifth Japanese midget submarine used Using in the attack in December 1941 .

The 1984 Air Canada Cup Competition was Canada 's sixth annual national midget 'AAA ' hockey championship Competition , which was played Competition April 17 – 21 , 1984 at the North Bay Memorial Gardens in North Bay , Ontario .