K IX was ordered on 27 June 1917, launched on 23 December 1922 and commissioned into the Royal Netherlands Navy on 21 June 1923.
K IX was based in the Netherlands East Indies from 13 May 1924. By the outbreak of the Pacific War in 1941, K IX was out of commission but was returned to active service in March 1942. Following the fall of the Netherlands East Indies K IX escaped to Fremantle, Western Australia, arriving on 13 March 1942.
Transfer to Australia
In May 1942 the Dutch government offered K IX to the Royal Australian Navy for use in anti-submarine warfare training. This offer was accepted and K IX arrived in Sydney for repairs on 12 May. On 1 June K IX was damaged by a torpedo explosion during the Attack on Sydney Harbour. K IX was decommissioned from the Royal Netherlands Navy on 25 July 1942 and following extensive repairs was commissioned into the Royal Australian Navy as HMAS K9 on 22 June 1943. Due to the boat's poor mechanical condition HMAS K9 saw little service with the RAN and spent most of her time in commission under repair. K9 was badly damaged by a battery explosion on 22 January 1944. Due to a lack of spare parts the submarine was decommissioned on 31 March 1944. Following her decommissioning K9 re-entered Dutch service as an oil lighter. K9 was washed ashore near Seal Rocks, New South Wales on 8 June 1945 while under tow to Merauke in Dutch New Guinea and was stripped for scrap.
- Carrunters (2006). p 151
- Carruthers, Steven (2006) . Japanese Submarine Raiders 1942: A maritime mystery (Revised ed.). Narrabeen: Casper Publications. ISBN 0-9775063-0-4.
- Submarines Association of Australia The Pioneers
- Dutchsubmarines.com The Submarine K IX
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