Background
Fasson was born in the village of Lanton, Roxburghshire, the son of Francis Hamilton Fasson, a Captain of the Scottish Horse, and Lilias Clara Fasson (née Bruce).
Fasson was born in the village of Lanton, Roxburghshire, the son of Francis Hamilton Fasson, a Captain of the Scottish Horse, and Lilias Clara Fasson (née Bruce).
Fasson was educated at Jedburgh Grammar School, and entered the Royal Navy on 6 September 1930, serving aboard the battleship Rodney as a midshipman until June 1933. Promoted to acting-sub-lieutenant on 1 September 1933, he attended the Royal Naval College, Greenwich and received promotion to sub-lieutenant on 16 May 1934, before being assigned to the light cruiser Curacoa on 5 January 1935.
On 15 September 1935 he was attached to the Royal Air Force with the temporary rank of flying officer in order to train as a pilot at the Number. 1 Flying Training School, Royal Air Force Leuchars. He returned to the navy on 16 June 1936 and joined the minesweeping sloop Salamander on 18 July 1936, receiving promotion to lieutenant on 16 September 1936.
From 19 April 1937 he served aboard the escort vessel Shoreham in the East Indies, before joining the destroyer Windsor as First Lieutenant on 5 August 1938.
Fasson was appointed First Lieutenant of the destroyer Hostile on 20 July 1939, and saw action in her on 10 April 1940 during the First Battle of Narvik, after which he received a Mention in Despatches. In early 1941 Fasson was posted to HMS Nile, the naval headquarters in Alexandria, Egypt, finally returning to sea duty in March 1942 as First Lieutenant of the destroyer Petard.
Death
On 30 October 1942 Petard, in conjunction with the destroyers Pakenham and Hero, the escort destroyers Dulverton and Hurworth, and an Royal Air Force Sunderland flying boat of 47 Squadron based in Portuguese Said, attacked and badly damaged the German U-boat U-559. The crew of the U-559 abandoned their vessel, with 7 dead and 38 survivors.
Fasson and Able Seaman Colin Grazier, along with NAAFI canteen assistant Tommy Brown, swam naked to the U-559 and entered the sinking submarine, which had water pouring in through seacocks left open by the Germans.
Working in complete darkness, fully aware that the submarine could sink without warning at any time, Fasson and Grazier located documents which Brown carried up to men in a whaler. They continued searching until the submarine suddenly foundered - "sank like a stone," drowning Fasson and Grazier. Brown survived. The awards were published in the London Gazette on 14 September 1943.
The codebooks that Fasson, Grazier, and Brown retrieved were immensely valuable to the code-breakers at Bletchley Park, who had been unable to read U-boat Enigma for nine months.
The captured material allowed them to read the cyphers for several weeks, and to break U-boat Enigma thereafter.