Scuba

Table of Contents
.

Scuba
SCUBA - self-contained underwater breathing apparatus

Scuba diving - Wikipedia - http://en.wikipedia.org/wiki/Scuba_diving
 * Scuba diving ("SCUBA" originally being an acronym for self contained underwater breathing apparatus, now widely considered a word in its own right) is a form of underwater diving in which a diver uses a scuba set to breathe underwater.

https://farm3.staticflickr.com/2939/14442929427_f4950b9580_m.jpg

Etymology
"The term "SCUBA" (an acronym for "self-contained underwater breathing apparatus") originally referred to United States combat frogmen's oxygen rebreathers, developed during World War II by Christian J. Lambertsen for underwater warfare. "SCUBA" was originally an acronym, but is now generally used as a common noun or adjective, "scuba"."