<Li> 1769: Giovanni Morgagni described the post mortem findings of air in cerebral circulation and surmised that this was the cause of death . </Li> <Li> 1840: Charles Pasley, who was involved in the recovery of the sunken warship HMS Royal George, commented that, of those having made frequent dives, "not a man escaped the repeated attacks of rheumatism and cold". </Li> <Li> 1841: First documented case of decompression sickness, reported by a mining engineer who observed pain and muscle cramps among coal miners working in mine shafts air - pressurized to keep water out . </Li> <Li> 1854: Decompression sickness reported and one resulting death of caisson workers on the Royal Albert Bridge . </Li>

Where did the term six feet under come from