In 1962 astronaut Scott Carpenter spent a total of 28 days below the surface of the Pacific Ocean, close to the La Jolla, CA coast, in the SEALAB II experimental underwater habitat. This was a world record and quite a feat considering the dangers of saturation diving. Congratulations were clearly in order and the consummate politician President Lyndon Johnson did not skip a beat. Carpenter, aided by Capt. George F. Bond, USN, M.D., was to call the President to receive his congratulations.
Astronaut Scott Carpenter spoke to President Johnson 200 ft below the surface of the ocean, but he was in a decompression chamber with a helium atmosphere and nobody could understand what he was saying.