Episode Two introduces us to some of the people racing to pump oil and gas from beneath the Arctic seabed. For the engineers constructing ice-breaking tankers and the crew on the world's northernmost oil rig, this race is all about excitement, opportunity and new frontiers.

In Episode One we meet scientists chronicling the effects of climate change on the land and animals. We see huge ice shelves crumbling into the sea, polar bears struggling to survive and torrents of water flowing where there should be only ice.