Can you run out of air while scuba diving?

Yes, you can run out of gas while scuba diving, but it should never happen if you plan your dive and monitor your pressure gauge regularly. Running out of gas is one of the most preventable problems in diving. Your tank does not suddenly empty. You get plenty of warning through your gauge and your plan if you are paying attention.

Most divers surface with a safe reserve, usually around 500 psi (35 bar) or more depending on the dive and environment. Good gas management means checking your gauge often and comparing it with your buddy’s so both of you know when to start your ascent. Many new divers get distracted by what they see and forget the basics. I have never come close to running out of gas because I plan every dive and stay focused. The only thing you must do underwater is breathe. Nothing is more important, not the camera, not your buoyancy, not even the whale shark swimming past you.

Sharing Air

Learn the differences between primary donate and octopus donate, their pros and cons, and how to practice with your buddy to be prepared for an out-of-air emergency.

Recreational Gas Planning Guide for Open Water Divers

Practical recreational gas planning: RMV basics, Minimum Gas Reserve, and turn pressure methods. Equations and examples included.

Minimum Gas Reserve | CAT Formula with Worked Example

Calculate your minimum gas reserve with the CAT formula. 100 ft example, ATA math, AL80 PSI conversion, and why divers round up for safety.