第一集《无路可退》的曝光片段，揭示探险队几个近乎终止旅程的关键时刻，甚至令他们怀疑是否根本不应启程。在那些关键时刻，如果他们决定继续向前再踏一步，便再无回头机会。

In this episode we unpack the moments that very nearly stopped the Expedition teams in their tracks on adventures that made them question whether they should even be out there, to the points where they knew if they took one step further, there was no turning back.