Work activities conducted underwater. Not the occupations, not projects, not organisations, only types of work activity done underwater. Not all underwater work involves diving.

• Equipment and tools specifically used for underwater work go in Category:Underwater work equipment or subcategory.
• Equipment and tools specifically for diving safety go in Category:Underwater diving safety equipment or subcategory.
• Equipment used generically for diving activities go in Category:Diving equipment or subcategory.
• Occupations which require work to be done while underwater go in Category:Underwater occupations.

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