ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Commercial diver checking a diving bell before the ascent to the surface. Commercial divers often have to work deep underwater under great pressures. They must undergo decompression at a gradual rate and cannot ascend to the surface without remaining inside a pressure chamber. The decompression time depends upon the duration and depth of the dive. Photographed in the French Mediterranean Sea.
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