Free diving is a sport a few people know about. It challenges the body and mind on a meditative level as breathing is the main thing you must practice. As a child, growing up on the Mediterranean coast, trying this sport was a 'must' between my friends. Usually their fathers and members of their families were fanatic lovers of apnea. After my first dive, my father gave me a Victorinox knife as a reward. I have it attached to my lower left leg every time I dive. "One Breath, One Sea..."