第一集《無路可退》的曝光片段，揭示探險隊幾個近乎終止旅程的關鍵時刻，甚至令他們懷疑是否根本不應啟程。在那些關鍵時刻，如果他們決定繼續向前再踏一步，便再無回頭機會。

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.