Introduction to Scuba Diving

Wikipedia Introduction to Scuba Diving
Where and when the term SCUBA was first used, the different types of scuba diving, Scuba certifying agencies, and information about Scuba diving issues such as breathing underwater, gas mixtures, diving injuries, the effects of breathing high pressure gas, underwater vision, controlling buoyancy, keeping warm underwater, mobility under water, and more.

See also:
More About Scuba Diving
Scuba Doll Home Page
Travel Guides International