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Underground settings are becoming increasingly relevant to global security and safety. Rising populations and urbanization are requiring military and civilian first responders to perform their duties below ground in human-made tunnels, underground urban spaces, and natural cave networks. Recognizing that innovative, enhanced technologies could accelerate development of critical lifesaving capabilities, DARPA today announced its newest Grand Challenge: the DARPA Subterranean Challenge, or SubT for short. Learn more at: http://www.darpa.mil/news-events/2017-12-21.