Cousteau, for instance

• Cousteau, perhaps, has an alternative for us
• An ace out at sea?
• Sealab dweller
• Skilled underwater worker or scientist — an ace out (anag)
• Sub tenant?
• Sealab inhabitant
• Bathysphere user

Wiktionary Word definitions in Wiktionary
n. 1 An explorer in a submarine. 2 Someone who lives or works underwater, for scientific reasons.

WordNet Word definitions in WordNet
n. a skilled worker who can live in underwater installations and participate in scientific research [syn: aquanaut ]