A British Army officer and explorer, Levison Wood, who embarked on three treks on camera, is back with his fourth documentary – From Russia To Iran: Crossing The Wild Frontier, that airs on Discovery every Friday. Beginning in Russia, the expedition sees him walk the vast Caucasus Mountains crossing through Azerbaijan, Armenia and finally, into Iran. In a chat with mid-day, Wood talks about why he chose to walk all these miles and the perils of travelling in the war zone.

Edited excerpts from the interview: