The vital undersea cable connecting the remote North American defense outposts with the mainland of the United States had broken again. Reaching the break area on December 12, 1966, the icebreaker braved extreme cold, continual darkness, gale winds, and heavy icing until the break was located and repaired. For their "extremely meritorious service in support of Coast Guard operations" during this emergency, "Edisto" and her crew were awarded the U.S. Coast Guard Unit Commendation for the period of December 2–22, 1966.