Why do divers get The Bends?

The air we breathe is 78%  nitrogen and 21% oxygen.Our bodies can't use nitrogen and We normally get rid of it when we breathe out.Underwater, the pressure on a diverse body increases. The diver is also breathing pressurized air which is mostly nitrogen from tanks. More and more nitrogen gets into the body as the diver goes deeper. this is ok until the diver starts back up. Rising fast makes the nitrogen form bubbles. This can cause a rash m coughing. dizziness, unconsciousness. and death. It also makes it hard to bend " To avoid this m a diver must rise very slowly. Then the nitrogen can escape through the lungs, molecule by molecule the only safe way.