Hyperbaric oxygen therapy (HBOT) involves breathing pure oxygen in a pressurized room or tube. Hyperbaric oxygen therapy is a well-established treatment for decompression sickness, In a hyperbaric oxygen therapy chamber, the air pressure is increased to three times higher than normal air pressure. Under these conditions, your lungs can gather more oxygen than would be possible breathing pure oxygen at normal air pressure. (HBOT) was first reported in The Lancet in 1887 and is best known for the treatment of deep-sea divers suffering from the "bends" (decompression sickness)