Hello, I really like scuba diving. My wife and I go all the time. 
Scuba diving is a form of underwater  diving in full body suits
You get to stay underwater, because you are breathing oxygen on your back.
you have to use a self-contained underwater breathing apparatus 
You get to see what the world is like underwater. watching all the life swim around you
Scuba diving
Scuba diving is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba), which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Although the use of compressed air is common, a new mixture called enriched air (Nitrox) has been gaining popularity due to
II. During the Second World War, captured Italian frogmen's rebreathers influenced improved designs for British rebreathers. Some British armed forces divers used bulky thick diving suits called Sladen suits, one version of which had a flip-up faceplate to let the diver use binoculars when on the surface.
In 1939, Christian Lambertsen developed an oxygen rebreather he called the Lambertsen Amphibious Respirator Unit (LARU) and patented it in 1940. He later renamed it the Self Contained Underwater Breathing Apparatus, which, contracted to SCUBA, eventually became