the permafrost of russia. nikita zima of trained as a mathematician. but his father sergei is lifelong commitment inspired nikita to change course. now like his father he has dedicated his life to preserving russia's permafrost. he's come to the river in northeastern siberia an eight hour flight from moscow to gather evidence that the promise frost is vanishing. the ground has warmed up to three degrees celsius causing the top layer of the ice to melt. one side effect is that more and more rare fossils are surfacing.