After an epic climb in Chile, Kamara and Josh have to answer a tough question; the Controller welcomes a new duo, Grace and Daniella, to St. Mark's Square in Venice; Tanaka and James dive into a hidden cave.
This high-octane episode sees the remaining pairs in some of the world's most iconic locations - from the secret rooftops of Venice, traversing high above the busy bazaars of Istanbul, and breath-taking jumps onto moving train in the Chilean desert. The Bone Brothers enjoy a rare moment of respite on the golden sands of Jamaica before an epic hunt for a scuttled vessel and a £200,000 question.