In order to economically transport fuel to remote research stations in Antarctica and Greenland, scientists must safely navigate hundreds of miles of ice sheets. Beneath the ice often loom large, invisible crevasses that pose a serious risk to those traversing the ice. Yeti, a robot designed by Thayer School of Engineering faculty and students and engineers from the United States Army Cold Regions Research and Engineering Laboratory in Hanover, is changing the way people detect these crevasses to ensure safer journeys for polar researchers.