noun
- a person who lives and works underwater for extended periods, especially in an underwater habitat
Examples
- The aquanaut spent three weeks living in the underwater research station.
- Marine biologists working as aquanauts study coral reef ecosystems up close.
- The aquanaut program trained scientists to conduct experiments while living on the ocean floor.
- She became an aquanaut to research the effects of pressure on marine life.
- The aquanaut team collected samples from the deep-sea habitat.
- Modern aquanauts use advanced breathing equipment during their underwater missions.