noun
aquanaut
A person who lives and works underwater for extended periods, often in an underwater habitat. Technical term; less common than ダイバー (diver).
アクアノートは海底基地で数週間生活する。
Aquanauts live in an underwater base for several weeks.
Borrowed from English 'aquanaut', a blend of Latin 'aqua' (water) and Greek 'nautes' (sailor), modeled after 'astronaut'.