This is the transcript of the unclassified portion of a hearing before two subcommittees of the U.S. House of Representatives. It includes testimony and prepared statements from the Deputy Director of the Defense Advanced Research Projects Agency and the Deputy Chief of Naval Operations of the U.S. Navy. Advances in submarine quieting threaten the anti-submarine warfare advantage. These quiet submarines pose a serious threat to the sea lanes of communication, and potentially a submarine-launched cruise missile threat.