Jon Lindbergh

He worked as a United States Navy demolition expert and as a commercial diver, and was one of the world's earliest aquanauts in the 1960s.

[2][3] During his mother's pregnancy with him, his parents received large numbers of letters and phone calls threatening his life.

[14] Lindbergh graduated from Stanford, where he had been a member of the Navy ROTC, and did postgraduate work at the University of California, San Diego.

He served for three years as a frogman with the United States Navy Underwater Demolition Team (UDT), reaching the rank of Lieutenant.

[16] In 1966, as part of a team from Ocean Systems, Inc., Jon Lindbergh participated in the recovery efforts when a hydrogen bomb was lost off the coast of Spain.

[17][18][19] In June–July 1964, Lindbergh participated in Edwin Link's second Man in Sea experiment, conducted in the Berry Islands (a chain in the Bahamas).

Sténuit and Lindbergh stayed in Link's SPID habitat (Submersible, Portable, Inflatable Dwelling) for 49 hours underwater at a depth of 432 feet, breathing a helium-oxygen mixture.