DARPA Subterranean Challenge Aims to Revolutionize Underground Capabilities December 27, 2017/Client: R & D Magazine, Uncategorized /by spireco1DARPA Subterranean Challenge Aims to Revolutionize Underground Capabilities spireco1 https://spirecommunications.com/wp-content/uploads/2017/12/SpireLogo-300x138.png spireco12017-12-27 13:20:332018-01-26 19:48:24DARPA Subterranean Challenge Aims to Revolutionize Underground Capabilities