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SERVICE HISTORIES of ROYAL NAVY WARSHIPS in WORLD WAR 2 - Summary by Lt Cdr Geoffrey B Mason RN (Rtd) (c) 2006


HMS THOROUGH - T-class Submarine

HM S/M Thorough (Navy Photos/Mark Teadham, click to enlarge) return to Contents List   

B a t t l e    H o n o u r s

 MALAYA 1944-45



 Perfice: 'Be thorough' 


First use of the name by the RN was for this submarine. She was nominated for service with the 4th Submarine Flotilla in the Eastern Fleet and took passage to Ceylon after working-up in Home waters.


Deployed for interception of coastal shipping off Burma and Siam, in the Malacca Straits and islands in the Indian Ocean. In September during Malacca, Straits patrol she sank a coastal ship. On 18 November 1944 she carried out a minelay on Outer Mati Bank off Sumatra (Operation MLO18) followed by one of Terutan, Malaya on 23rd December (Operation MLO22) during which she sank three Junks by surface gunfire.


Further successes followed in February 1945 when she sank three coastal ships, a landing craft and several Junks by ramming or gun attack. This submarine was then transferred to Fremantle Australia with the Flotilla and deployed for interception of shipping in Java Sea during the allied military advance into enemy held territory in the SW Pacific. In April during a patrol in her new area she sank two more coastal ships, three landings craft and a gunboat and the next month a supply ship, three coasters and a sailing ship. The Flotilla was then transferred to Subic Bay for service with the British Pacific Fleet and she was deployed for interception of coastal traffic in the Gulf of Siam and South China Sea where she was deployed with for a joint patrol with HMS TACITURN and attacked a convoy which included an ex-Netherlands Navy submarine and a vessel under tow. The ships in convoy were sunk by the two submarines.


Her last patrol with HMS TACITURN and HMS TIPTOE was in the west Java Sea and six small craft were sunk. Before return to Fremantle and after VJ Day she was attacked by two Japanese aircraft in Lombok Strait. Her Commanding Officer was Lieutenant A G Chandler RNR.


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