2017 One Dollar Submarine Attack on Sydney Harbour High Relief Coin.
With a very small mintage of just 750, the 2017 $1 Attack on Sydney Harbour High Relief 1oz Silver Proof commemorates the 75th anniversary of one of the most important moments in Australian military history.
On the night of the May 31, 1942, three Ko-hyoteki class midget submarines slipped into Sydney Harbour. Two were detected before they could launch their torpedoes, with the vessels scuttled and the crew committing suicide. The third submarine sank HMAS Kuttabul, with the loss of 21 lives, before disappearing. Although largely unsuccessful, the midget submarine operation reinforced the fear that the invasion of the Australian mainland was imminent.