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Duke Nukem 3D Hints
Scuba Gear
There are certain sections in the game that you will almost certainly drown in if you don't have Scuba Gear. Just as in real life, having one of these will allow you to be underwater for a long period of time. There is, of course, a limited supply of oxygen, but it does last awhile. You shouldn't have to worry about drowning until the tank gets to about 15%.
