air-sea rescue 
noun chiefly British
A rescue of a person from the sea using aircraft.On Thursday, three fishermen had to be rescued by an air-sea rescue helicopter as a rising tide left them cut off from the mainland....
- He got into difficulties in the late afternoon and an emergency call was made to the air-sea rescue services.
- Coastguards called off the search involving a police helicopter and the air-sea rescue helicopter from a nearby airbase.