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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.
1 In a pencil dive, you strive to make your body as slim and straight as a pencil. Jump feet first with your arms held tightly to your sides and your feet pressed together and pointed downward. This minimizes the surface area that strikes the water, reducing the force of impact.  Use the buddy system.