Decompression (diving) but in later experiments signs of what was later to become known as decompression sickness were observed. Later, when technological advances allowed the use of pressurization of mines and caissons to exclude water ingress, miners were observed to present symptoms of what would become known as caisson disease, compressed air illness, the bends, and decompression sickness. Once it was recognized that the symptoms were caused by gas bubbles, and that re-compression could relieve the symptoms, Paul Bert showed in 1878 that decompression sickness is caused by nitrogen bubbles released from tissues and blood during or after decompression, and showed the
Ratio decompression unacceptably high risk of decompression sickness. However, the technique has undoubted value in emergency situations where a dive plan is "blown" for one reason or another, and a personal dive computer is not in use. Although to date no independent forensic review of ratio decompression as a decompression algorithm has been conducted, in his book "Deco for Divers", Mark Powell considers ratio decompression, and analyses it in slightly simplistic "flattening the curve" terms, illustrating it by way of comparison to certain more traditional models. Nonetheless, given the limited amount of forensic research available on any decompression algorithm, it is difficult