Four vessels, four missions, one frozen ocean. The CCGS Amundsen carries scientists into the Arctic to track how the region's ice, currents, and ecosystems are shifting as the climate warms. The icebreaker Henry Larsen shoulders through thick sea ice to resupply isolated High Arctic communities and run rescue operations when lives are on the line. The expedition ship MS Fram threads Greenland's fjords, ferrying passengers past glaciers and coastline few people ever see up close. Finally the Norwegian research vessel G.O. Sars drops instruments into the Arctic Ocean's depths, hunting for undiscovered species and mapping a seafloor still largely unknown. Each segment stays on the working deck and in the labs, following crew and scientists through ice navigation, sampling routines, and the physical grind of operating machinery in sub-zero conditions. Together the four profiles build a picture of what it actually takes, mechanically and personally, to keep ships moving and research running at the top of the world.