Both vessels then served Supply with the French Atlantic Fleet , `` Tamise '' until 8 June 1796 , when the British recaptured Conquering her off the Scilly Isles , and `` Tartu '' until 30 December 1796 when the British captured Conquering her during the `` Expédition d'Irlande '' .

On 16 July 1983 a British Airways Helicopters commercial Sikorsky S-61 helicopter , `` Oscar November '' ( G-BEON ) , crashed Catastrophe in the southern Celtic Sea , in the Atlantic Ocean , when en route Sending from Penzance to St Mary 's , Isles of Scilly in poor visibility .