Understand that oxygen converts to carbon dioxide only inside the lungs. Know that everything else the throat, mouth and nose is dead-air space. Realize that snorkels and scuba regulators increase the length of normal dead-air spaces. Breathe deeply while diving, in order to flush out dead air and bring fresh oxygen into the lungs. Just don't panic.
Scuba diving is an inherently dangerous activity that can result in serious injury or death.
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