Risk of Return
divers face an array of dangers as the pressure drops
and their lungs re-expand
to the surface from extreme depths poses a risk as well. The
decreasing water pressure allows the lungs to re-expand. As
the volume of the lungs increases, the pressure exerted by
the oxygen remaining in the lungs drops. The oxygen can no
longer enter the blood stream. When the blood oxygen levels
become too low, an ascending diver may pass out before reaching
the surface. Similarly, pockets of air trapped in the lungs
can expand during ascent, possibly tearing the delicate tissue.
Air then invades the blood stream, resulting in immediate
Leferme and his colleagues try to monitor each other's reactions
closely for any signs they are nearing their dive limits.
Free diving is clearly a dangerous sport.
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