The scuba mask is what compensates for water's greater light refraction and allows your eyes to focus properly underwater.
The regulator houses the valves that release compressed air from the air cylinder to you at a breathable pressure. Attached are the pressure gauges for determining local water pressure and the air remaining in the tank as well as two mouthpieces for breathing and a hose that connects to the buoyancy control device (BCD).
The BCD is a vest with air bladders inside it or attached to its back. Adding and subtracting air to the bladders allows you to adjust your buoyancy and "hover" in place while underwater.
The fins are a necessary swim aid, increasing the surface air of the foot and increasing your swimming power.
Wetsuits are necessary for scuba diving in all but the warmest waters. Even 80 degrees F water, which would be fine for swimming at the beach, is cold enough to require a 3 mm wetsuit.
Wetsuits and the air in your lungs are sources of buoyancy, and the remainder of your equipment isn't heavy enough to allow you to sink to the bottom and stay there. That is why all divers wear a belt with lead weights, usually carrying 12 to 25 lbs.
Article Written By Edwin Thomas
Edwin Thomas has been writing since 1997. His work has appeared in various online publications, including The Black Table, Proboxing-Fans and others. A travel blogger, editor and writer, Thomas has traveled from Argentina to Vietnam in pursuit of stories. He holds a Master of Arts in international affairs from American University.