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HMS Oxley was an O class submarine built by Vickers-Armstrong Limited at Barrow-in-Furness in England, launched on 29 June 1926 and commissioned on 1 April 1927 for the Royal Australian Navy as HMAS Oxley. HMAS Oxley paid off on 9 April 1931 and transferred to the Royal Navy on 10 April 1931.
HM Submarines Oxley and HMS Triton were patrolling off Norway on 10 September 1939 and had been in regular contact when Triton spotted an unidentified submarine off the coast of Norway. Believing it might be Oxley a number of signals of recognition were flashed by Triton. No reply was forthcoming and after several challenges Triton fired two torpedoes that struck the submarine and sent her to the seabed. Triton closed in on the area and found three survivors. A Board of Enquiry found that Oxley was some way out of position and that Triton had acted correctly and was not culpable for the sinking.