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Answer Wiki. As John suggests, divers that ascend too quickly can get an air embolism. Bends (decompression sickness) is slightly different and requires a diver to have been at some depth breathing a nitrogen mixture for some time. You can get an embolism even if you havenât been down long enough to need decompression stops.
Decompression sickness, also known as the bends, is one danger of diving. Other dangers include nitrogen narcosis, oxygen toxicity and simple drowning (if you run out of air before making it back to the surface).