The increase in water pressure with depth affects almost all aspects of scuba diving, including equalization, buoyancy, and bottom times.
What to Know About Decompression Sickness
In the past deep sea divers had suits with heavy helmets and an air hose attached. There are stories of the air failing. Because of the extreme pressure, they have found nothing
What is Decompression Diving?
New Human Physiology Ch 19
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Scuba diving after flying is ok, but not flying after diving
Decompression sickness: Symptoms, causes, and more