Scuba Diving is an ever-growing hobby all over the world, with divers of all ages donning their masks and suits and getting into the water. According to the Sports and Fitness Industry Association there are as many as six million active scuba divers worldwide , and six million people can’t be wrong. But like most hobbies, there is some must know information before you start, so you know your BCD from you SMB and your computer from your regulator, so let’s take a look at a few. 1. Cylinder/Tank: This is a pretty easy one, but mustn’t be forgotten. The cylinder (also known as a tank) is used in diving to hold the air you breath while underwater. The tank is used in conjecture with a regulator, which is responsible for circulating the air and controlling the amount of gas you receive. Without the tank there would be no SCUBA diving. 2. Buoyancy Control Device: A bit more of a specialist term, you w...