In order to go diving, you need some equipments. First divers carry their backs a metal bottle, which is filled of water. There’s enough air in it to last about 40 minutes. Next, divers carry heavy metal weights in a belt around its bodies. With these heavy weights they would float to the surface. You see, there are a lot of air in their air bottles, and this will bring them up to the surface if they didn’t have any more weights. Mostly divers don’t go very deep.