it depends on the depth you are assenting from and the speed.
However if your were on 30m deep and assented too fast without equalizing and continuance breathing you can hurt your lung and ears
Please see the answer in the question "What does decompression mean in diving?"
Nitrogen that is dissolved in the blood stream turns back to gas and forms bubbles in your blood stream and throughout your body. Usually fatal.
they get the bends
When a diver surfaces too quickly he gets 'the bends'.As the diver goes down, the pressure causes nitrogen to dissolve in the blood. That's harmless.On the way up the diver must allow time for the nitrogen to come out of the blood slowly. If the diver comes up faster than the recommended timing, the nitrogen gas will form bubbles and block small blood vessels, causing 'the bends' a painful and life threatening condition that is cured by putting the patient in a pressure chamber and bringing the pressure down very, very slowly.
Yes. If they hold their breath their lungs would expand until the burst.
because bubbles of nitrogen that are abosrbed into the blood at high pressures but are normally insoluble start being released from the blood as the diver rises. If this happens to quickly bubbles in the blood form and the diver gets the bends
The stunt diver
During the deep dive the divers body goes through immense pressure. The atmospheric pressure in the deep as one goes more deep it increases so the lungs of the diver has to do more work and also that if the diver comes up on surface faster ten the rate he went down then the helim would be formed in the lungs of diver which can be lethal.
Yes!!! We can hear the engine of a boat in the water because water particles pass vibrations more quickly than the air particles
If you are talking about a gas that is in solution the easiest thing is to reduce the pressure so the gas comes out of solution, similar to a diver ascending in the water column too quickly.
The stunt driver
If helium replaces the nitrogen in normal air, the pitch of the diver's voice will increase considerably.
Tom Daley the British Diver comes from England.
There are two types of diver down flags - the diver down flag and the alpha flag. The red diver down flag is used when divers are in the water to alert boats to the possibility of divers near the surface, and the blue alpha flag is flown by a boat whenever the mobility of the vessel is restricted.