A deep-sea explorer is someone who studies and investigates the depths of the ocean. The term can refer to a variety of different occupations, such as a ROBOT, which is an automated machine used to explore the ocean floor; a DIVER, who uses specialized equipment to explore underwater; a BEEBE, who is a scientist who studies the ocean's depths; a SCUBA DIVER, who uses self-contained underwater breathing apparatus to explore the ocean; a COUSTEAU, who is a French naval officer and explorer; an ORCA, which is a type of whale that dives deep into the ocean; and a SONAR, which is a device used to detect objects underwater.