The story is based on the real events of 1985. The team of a Russian polar icebreaker �Mikhail Gromov� discovered a giant iceberg. The ship came into collision while attempting to take cover from the weather and is forced to drift with ice along the Amundsen Sea coast. The crew of �Gromov� spent 133 days of polar night trying to find a way out of their icy trap. They have no room for mistakes; one wrong move and the vessel is crushed by ice.