845 reformed on 15 March 1955, at Gosport to be an Anti Submarine unit flying the newly proved Westland Whirlwind HAS.22's, with which it saw service on several ships in the Mediterranean and Indonesia. Its job was to prove the new sonar technology and the navigational reliability of the Whirlwind. After returning to the UK, the squadron was disbanded briefly in October, before being reformed on 14 November 1955. In April 1956, the squadron deployed on and to partake in the fleet review and various training exercises. Much training was conducted with the Royal Marines in the vicinity of Malta and put them in great stead for the approaching Suez Crisis.