portable hyperbaric chamber in 1997 a hiking expedition with stranded for 38 days in the Tibetan side of mount Everest at altitudes over 5200 m for 30 days the party was stranded above 6500 m in severe weather conditions well at altitudes over 8000 m 10 climbers Suffered acute mountain sickness 37-year-old climber with acute pulmonary edema was treated with a portable Gamow bag. named after its inventor Igor Gamow. the Gamow bag is I windowed cylindrical portable hyperbaric chamber constructed of non-permanent will not on that requires constant pressureization with a foot pump attached to the bag the climber interest the bag and a purse and Elsa pump air into the bag so that the air pressure inside a somewhat higher than outside pressure. The bag and pump have a 6.76 kg mass the volume of the insulated bag is .476 m³ to maximal bag pressure is .14×10 to the 5th N meter squared above the air pressure at the site where it is used in the 1997 climb the temperature at -20°C the bag was filled in about two minutes with 10 to 20 pounds per minute this raise the pressure in the bag to.58*10^5 N/m^2 instead of the actual outside pressure of .43×10 to the 5th N meter squared at the 6450 m elevation the treatment lasted for two hours with the person in hailing about 15 times per minute at about .5 L inhalation and was successful the pulmonary edema disappeared