A diver can surface feeling fine, rinse gear, laugh with friends, and only later notice a deep ache in the shoulder or a strange tingling in the feet. That delay is one reason decompression sickness can be so dangerous. It does not always announce itself underwater. It can appear minutes to hours after a dive, and in serious cases, it can affect the brain, spinal cord, lungs, skin, joints, or inner ear. Decompression sickness, often called “the bends,” is a medical emergency

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