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Caisson disease Was the old name for decompression sickness. It is named after it appeared in construction workers when they left the caisson and had rapid decompression. It is caused by the same processes as decompression sickness in divers. The Brooklyn Bridge was constructed with the help of caissons, and several workers died of caisson disease. Caissons ar ehollow concrete blocks, which were sunk to the bottom of the seabed, filled with compressed air, to keep the water out, while the workers dug away at the mud in order to sink the concrete onto a firm base.
Decompression sickness happens when a diver ascends rapidly from a dive or does not carry out decompression stops after a long or deep dive. These situations cause inert gases, generally nitrogen, which are normally dissolved in the blood, body fluids and tissues, to come out of the dissolved state (i.e., outgas) and form gas bubbles.