1. people who live and work underwater for extended periods, especially in underwater habitats or research stations
Usage: technical; oceanography

Examples

• The aquanauts spent three weeks living in the underwater laboratory.
• NASA trains aquanauts to simulate conditions astronauts might face in space.
• The research team of aquanauts studied coral reef ecosystems from their underwater base.
• Modern aquanauts use advanced breathing equipment to work beneath the ocean surface.
• The aquanauts documented marine life behavior that had never been observed before.
• Training to become an aquanaut requires extensive diving experience and scientific knowledge.