Player Embed Code: <iframe width='500' height='300' scrolling='no' frameborder='0' style='border: none; overflow: hidden; width: 500px; height: 300px;' allowtransparency='true' src='https://www.dvidshub.net/video/embed/815212'></iframe> Download Embed Share Day 3: DARPA's Subterranean Challenge Wraps Up Final Event, Part 4 Defense.gov Sept. 24, 2021 | 55:26 The Defense Advanced Research Projects Agency wraps up the final events of the Subterranean Challenge with the virtual competition and the systems competition prize rounds at the Louisville Mega Cavern in Louisville, Ky. The announcement of the grand prize winners follows at an awards ceremony; roundtable discussions begin afterward.