A person trained to live and work underwater for extended periods in underwater habitats or submarines, comparable to how an astronaut works in space.
Modeled on 'astronaut,' combining 'aqua' (Latin for water) with '-naut' (from Greek 'nautes,' sailor). The term emerged in the 1960s during underwater exploration programs like Jacques Cousteau's Conshelf experiments.
Jacques Cousteau created the first true 'aquanauts' in 1962 when divers lived underwater for weeks in his Conshelf habitats—these brave explorers proved humans could adapt to extreme underwater pressure and opened a new frontier of ocean science.
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