The easiest way to check if your mask fits is to hold it over your face and inhale through your nose. If the mask is a good fit, it should stick to your face without the strap around your head. If you can still inhale, then the mask does not fit properly.
An excellent video presented by Lamar Hires, chairman of the National Speleological Society Cave Diving Section. Lamar goes over the common hazards of cave diving and why you need the correct training, experience and equipment to cave dive.
This is an absolute must watch video for anyone who is thinking about going cave diving.
Want to know more about cave diving?
"The Darkness Beckons" is a great book that will open your eyes to the history and dangerous of modern cave diving.
