Follow Steve on a mission to explore an unmapped volcanic underworld in search of the longest lava tube in Arabia. On this expedition, Steve and his team start their journey at the ancient city of Hegra, where secrets lie waiting to be uncovered.
Duration: 56 minutes and 46 seconds
Episode Number: 202
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Head into the unknown with explorer Steve Backshall as he journeys to the world's last unexplored places and faces challenges around the globe, encountering extraordinary wildlife and meeting remarkable people along the way.
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