It enables you to breathe underwater.
Most people enjoy Scuba for purely recreational reasons, but obviously it also has commercial and military applications.
5,100 inches
Either, depending on context. Usually, if used as a noun it is SCUBA; as an adjective, as in scuba diver, it is just scuba.
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Scuba diving.
A scuba diver is a human who enjoys scuba diving. Therefore, a scuba diver has a spine and is a vertebrate.
No, but "scuba-diving" is a verb.
'SCUBA' is a noun, referring to the breathing apparatus. 'SCUBA dive' is the verb, with 'SCUBA dived' as the past-tense form.
It's an acronym: Self-Contained Underwater Breathing Apparatus = SCUBA (not scuba)
Scuba was invented by the navy.
No, they can't scuba-dive.
I would decide not to scuba dive -- or climb a mountain, or parachute from an airplane -- if I felt the potential risks and costs outweighed the potential benefits. In the case of scuba diving, such risks include SCUBA apparatus failure, the Bends, nitrogen narcosis, shark attack, or being stranded in mid-sea following a group diving expedition. There would also be the cost of training, certification, and equipment (whether renting or purchasing). How I weigh these against the benefits of diving (the likelihood of adventure, potential for learning, bragging rights among my peer group, etc.) is a judgment call that only I can make for me, and only you would be able to make for yourself.
There are scuba diving classes and popular scuba diving areas in Sydney, Australia. Scuba diving clubs are not advertised in that area.