I jus went ot researched bout that wad blood stream thing == Mr Pang tell us go research, okay, so let me tell you guys, why will bubbles form in the bloodstream if a diver suddenly comes up fom deep waters to the surface of the water, the answer is because, Nitrogen makes up 70% of the air we breathe (in the air around us and in our diving bottles). During a dive, large amounts of nitrogen are taken into the body's tissues. This is because the diver is breathing air at a higher pressure than if they were at the surface. The quantities of dissolved nitrogen depend on the depth and duration of the dive. The deeper and longer the dive, the more nitrogen is taken up by the body. This does not present a problem as long as the diver remains under pressure. As the diver begins to ascend to the surface, the surrounding pressure falls, and nitrogen is released from the body via the lungs when the diver breathes out. If the rate of ascent exceeds that at which nitrogen can be released, it forms bubbles in the blood and tissues (similar to opening a bottle of fizzy drink too quickly).


researched from: http://www.navis.gr/medico/divers.htm

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