The training and work of the Royal Naval Air Service.
Over shots of a dinghy sailing race among moored warships, the commentary speaks of the importance of airpower in modern naval training. The film then provides a brief picture of some aspects of the training of personnel first in basic seamanship, later in specialised aircraft work (RNAS Shore Station HMS Heron): men and women receive instruction in aeroengine maintenance; aircrew (in classroom) are played recording of underwater noises as prelude to lesson on sonar buoys. (Film digresses to explain to the audience in a sequence in which a Firefly drops sonar buoys to guide its attack on a submerged submarine. The second half of the film shows a naval exercise (starting from Gibraltar) in which a strike force of Firefly and Sea Fury aircraft from a carrier "attack" a cruiser; the undercarriage of one Sea Fury collapses on landing back on the carrier. Closing commentary (over film of a Supermarine Attacker) pledges RNAS' constant readiness.