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Charlie chamber is a large sphere that measures 20 feet in diameter and can be a pressurized to 7.8 ATA (225 feet of sea water). The chamber is equipped for long duration exposures with oxygen-helium or air, and is large enough to support complex investigational procedures, surgery, and multiple patient hyperbaric oxygen treatments. The lung lavages carried out on patients with cystic fibrosis, alveolar proteinosis and other diseases are also performed in this chamber.