8 Remember that you cant breathe water pixabay -1062895_1920.jpg

Pixabay

“There's a huge ‘duh’ factor here, but divers still run out of air sometimes, even though you know how much you have. Plan your air use and head for your exit with ample gas and a reserve,” Shreeves says. “If you're doing so properly and have no unforeseen issues, you should be back on the surface with your reserve intact.”