Initial use of compressed air for treatment of "Caissons disease" which was forms of Decompression sickness seen in the use of Caissons in the 1800s.
Further research was performed in 1930s-1940s through the Navy.
1986 the Undersea<unk>  Society became the Undersea and<unk>  Society
2000 UHM became a board certified through ABEM, there are currently
Hyperbaric medicine
Blister chemical agents
Local anesthetics
Bioterrorism antibiotics
Laxatives
Advanced airway adjuncts
Poison control
Hemostatic agents