Wikipedia
The Seenotdienst (sea rescue service) was a German military organization formed within the Luftwaffe (German Air Force) to save downed airmen from emergency water landings. The Seenotdienst operated from 1935 to 1945 and was the first organized air-sea rescue service.
The Seenotdienst was at first operated as a civilian service run by the military, and later was brought formally into the Luftwaffe. Throughout their existence, the group solved a number of organizational, operational and technical challenges to create an effective rescue force. When British and American air leaders observed the German success, they modeled their own rescue forces after the Seenotdienst. As the Allies of World War II advanced, denying sea areas to German forces, local groups of the Seenotdienst were disbanded. The last active group served in the Baltic Sea in March 1945.