Nazi medical experiments : a prisoner is submerged in a tank filled with cold water.

Nazi medical experiments : a prisoner is submerged in a tank filled with cold water. The goal of this type of experiments was to check how long German pilots, who had to parachute into the cold north sea, would survive. Different types of clothing were tested, as well as different methods for reviving the experimental subjects who survived.
Source: The Pictorial History of the Holocaust, edited by
Yitzhak Arad, Macmillan Publishing Company, NY, 1990, p.310.