4/9. After reaching Shangri-La in China, the teams discover where they're headed next - one of the world's oldest living cities, Varanasi. Also in HD. [S,AD]
4/9. The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world. Also in HD. [S,AD]
5/9. The teams head for Lake Huron, a 3,000-kilometre journey, but the pairs only have one way out of Churchill - a noisy overnight train south. Also in HD. [S,AD]
5/9. The teams head for Lake Huron, a 3,000-kilometre journey, but the pairs only have one way out of Churchill - a noisy overnight train south. Also in HD. [S,AD]
4/9. The teams head for the fourth checkpoint, the remote outpost of Churchill, on Hudson Bay. The only transport is a twice-weekly train, and they have just three days to catch it. Also in HD. [S,AD]