This film shows experiments conducted during World War II on behalf of the National Research Council to better understand decompression sickness. Dr. Edmund Newton Harvey was best known for his research on bioluminescence, but he also conducted applied research in areas such as wound ballistics and aviation physiology. In these experiments, Harvey explores the phenomenon of bubble formation in blood and tissue. At certain altitudes and air pressure levels, excess gas is dissolved in the body, resulting in bubble formation and "compressed air illness." The extent to which this occurs at high altitudes, and its effect on aviators, is the subject of the investigation shown in this footage.
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