Two University of Southern California medical students climb back onboard the Coast Guard Cutter Halibut after testing the cold waters of the Pacific Ocean, April 7, 2015. A group of 10 students entered the water to learn more about the affects of hypothermia on the body and also saw rescue training by an HH-65D Dolphin helicopter aircrew from Air Station Los Angeles. (U.S. Coast Guard photograph by Petty Officer 1st Class Adam Eggers)