[1] Operating for the first time with the Eastern Fleet at Colombo in Ceylon, Commander Bill King on 13 July had put himself in a position known as One Fathom bank in order to intercept Japanese traffic between Penang and Singapore.

They waited until the 17th when submerged, the ASDIC operator alerted King to the sound of propellers, and the watch soon spotted a Japanese submarine; that being I-166.

[2] Despite limited visibility because of mist, Telemachus tracked I-166 for 30 minutes, waited until it was less than a mile distant and reached the firing point beam on.

This manoeuvre however, failed and Telemachus lost control and briefly broke surface.

King was awarded a Distinguished Service Cross (DSC) on 16 January 1945 "For outstanding courage, skill and determination in one of H.M. Submarines in successful patrols in Far Eastern waters"[5] (specifically the sinking of the I-166).