Quite a logistical challenge in more ways than one
Egyptian Scuba Diver Sets World Record after Spending 6 Days Underwater in Red Sea
Egyptian Scuba Diver Sets World Record after Spending 6 Days Underwater in Red Sea
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Ended up buying a water heater and running a hose into his suit.
Hot water suits are common in commercial diving and keep you reasonably comfortable but I've never used one for more than a couple of hours.
While eating and drinking is possible underwater, frequently done on long deco stops, and peeing is possible in a dry suit, there is a question of .... well number twos
An adult diaper might be good for for 6-12 hours, but SIX DAYS
It pains me to recall the memory, but the Warhammer maneuver would seem to be the solution.