Best friends Joel Dommett and Nish Kumar travel to locations across the globe to immerse themselves in the lives of the toughest, strongest, fittest people in the world.

Guillaume Dulude, doctor of neuropsychology, sets out to find the last nomadic tribes in the world in an effort to understand how they manage to survive while retaining their traditional way of life.

Sue Perkins experiences the modern phenomenon of #vanlife in the USA, as she campervans across California and Colorado to discover the highs and lows of life on the road.

When she was a child, Kate Humble wanted to be a nomad. Living in some of the world's most remote wildernesses, cheek by jowl with nature, seemed like such a wildly romantic existence.

在非洲东非大裂谷的北端，有一块地球上独一无二的地方：那就是埃塞俄比(Ethiopia)的达纳基尔(Danakil)沙漠。或许那里是已知的最不适宜人类居住的地方了，火山和地震的轮番袭击，喷出火山岩浆和有害气体，持续撕裂着地表。这是被证实承认的地球上最热的地方，任何人都能在这居住的想法有够荒唐？！但是还真有人在这生活着，已经居住了千年。一个传说中的勇猛游牧部落 叫做阿法尔(Afar)的部落！一支科学家团队进行这段难以置信的旅程，希望能够发现人在这种极端环境下的生存之道，他们的生活，甚至是他们的生理，是如何被周围的环境塑造的？我们想探索这块神奇土地的地表之下是什么？想要解开她的秘密。