Aquanaut Tours, aquanauttours.com, can organize a day's fishing at sea or from the shore.
From the time.com
He now often appears in the garb of an astronaut or aquanaut.
From the time.com
An aquanaut and Mission Commander on seven NASA underwater missions, Chamberland has also pursued landmark research in bioengineering and become a prolific writer of science books and sci-fi novels.
From the cnn.com
More examples
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.