A powerful four-legged robot can get back on its feet after being knocked over demonstrating the robustness needed for hazardous search and rescue missions. You can't keep a good robot down. HyQ2Max is a tough and powerful quadruped designed to get back on its feet when knocked over. It was built by roboticists from the Italian Institute of Technology. Four-legged, animal-like robots, they say, can cope better with hazardous environments than typical wheeled or tracked vehicles.