D. Remove your tank and regulate airflow with the tank valve

The questions and answers for this Scuba 101 were taken from Dennis Graver's 100 Best Scuba Quizzes. Aqua Quest Publishing, NY, 1197.

C. Breathe from your free flowing regulator while ascending
A free flowing regulator can over pressurize your lungs if the regulator is left in your mouth, but not if it is removed. It is possible to breathe from it safely by pressing you lips against the mouthpiece.


Seems all three of us got this one right !!

Mike