- skin-diver: an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder
- a skilled worker who can live in underwater installations and participate in scientific research
- An Aquanaut is any individual who remains underwater, exposed to the ambient pressure, long enough to come into equilibrium with his or her breathing media. ...
- (The Aquanauts (TV series)) The Aquanauts (later known as Malibu Run) is an American adventure/drama series that aired on CBS in the 1960-1961 season. The series stars Keith Larsen, Jeremy Slate and Ron Ely (who later replaced Larsen).
- An underwater explorer
- a scuba diver who works for an extended period of time from and around a submerged dwelling.