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Since the development of the open circuit scuba by Jacques Yves Cousteau and Emile Gagnan in 1943, man has been able to enter the aquatic realm for extended periods with new found ease and freedom on scuba. With this one technological breakthrough, man gained a direct window to the aquatic realm by periodically and temporarily becoming part of it.
Scuba diving is the act of swimming underwater while using self-contained breathing apparatus. By carrying a source of compressed air, the scuba diver is able to stay underwater longer than with the simple breath-holding techniques used in Snorkeling and Free-diving, and is not hindered by air-lines to a remote air source.