Most of our knowledge about hypothermia came from terrible experiments on people in Nazi Germany. The testers were dressed in flight suits and life jackets of various designs, inserted a probe into the stomach of an electric thermometer and a similar thermometer-in the rectum and placed them in pools of cold water in the range of 2.5 to 12 degrees Celsius. People, freezing, experienced the most severe torment and screamed, about an hour later falling into a semi-conscious state, and the screams subsided. During the ”experiments " all the testers were killed. At a water temperature of 2.5 degrees Celsius, the strongest test subject lived to cardiac arrest for 100 minutes, the weakest 53 minutes.
