WARNING: Any training materials are for the use of qualified divers, or divers in training under the supervision of a certified Instructor. When attempting any unfamiliar skill, or type of diving, it is recommended that advice or training be sought from a certified Instructor. Do not attempt to learn to scuba dive except under the direct supervision of a certified Instructor. If you attempt to learn to scuba dive without the direct supervision of a certified instructor, you will be exposing yourself to risk of serious injury or death.