A research team sets out to measure the world's largest and oldest sea ice floes 500 nautical miles from the North Po. Steve is an expedition leader who has led projects in the High Arctic for 40 years. Chris is a polar oceanographer who studies ice floes from a Harvard lab. They know the data, the models, the science. None of that has prepared them for the truth on the ground. The floes are crumbling and collapsing, the old ice is gone.