The only U.S. heavy icebreaker broke down on a mission to Antarctica again Melody Schreiber, Arctic Today, February 1, 2091 The Polar Star, the only operational U.S. heavy icebreaker, reached Antarctica on its annual resupply mission to McMurdo Station on Jan. 17 — but not without encountering difficulties along the way. First, one of the electrical systems started smoking. The … read more