Another concern was survival time after parachuting into the cold water of the North Atlantic. Some victims of this research were immersed for hours in tubs of ice water; others were fed nothing but salt water for days. Still others were penned outside, unclothed and unsheltered in sub-freezing temperatures from 12 to 14 hours. Some of these “freezing victims” were sprayed with cold water. No attempts were made to relieve the tremendous pain and suffering caused by these experiments. Three hundred Dachau prisoner-subjects suffered a mortality rate of 30%.