Nicole A. Mann, NASA astronaut, prepares to be flipped upside down by Survival Evasion Resistance and Escape specialists during a water survival course at Fairchild Air Force Base, Washington, May 18, 2018. One simulation that the NASA team completed during their stay at Fairchild, was the dunker course. Trainees are strapped inside a modular egress training system that simulates a mock helicopter with lap belts that submerges into water and rotates to teach aircrew how to find their exits to safety. (U.S. Air Force photo/Airman 1st Class Jesenia Landaverde)

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Photo by: Airman 1st Class Jesenia Landaverde |  VIRIN: 180518-F-PH996-291.JPG