Related Clues:

• ___ tank
• Certain explorer's gear
• Underwater breathing gear
• Putrid
• Snorkel alternative
• Frogman's acronym
• Go deep, perhaps
• Diver's apparatus
• It can take a dive
• Underwater tank
• Like many a residential system
• Diving apparatus
• Explore reefs, in a way
• Swim with the fishes, say
• Underwater breathing aid