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What are the most important things to know about scuba diving?
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1.  Scuba diving is an activity that involves breathing underwater and exploring the ocean environment using a self-contained underwater breathing apparatus (scuba).
2.  The primary components of a scuba set up include a regulator, tank, buoyancy control device, and mask.
3.  To dive safely, it is important to have adequate training, proper equipment, knowledge of the area you will be diving in, and a good understanding of your own limitations.
4.  When diving, always stay within your limits and follow all safety procedures.