Catch up TV

Series 2: Episode 2

As Saudi Arabia opens up to the outside world, miles and miles of its vast desert landscape remain completely unknown. Over 120,000 years ago, the Arabian desert was a pathway for the first human migrations out of Africa.\n\nOn this expedition, Steve and the team are following in ancient footsteps to shine a light into the unknown. Joining forces with Saudi Arabian geologists Mahmoud Al-Shanti and Hala Alwagdani, Steve and ropes expert Aldo Kane head down into an unexplored volcanic underworld in search of the longest lava tube in Arabia.\n\nGeological evidence suggests that at least 400km of tunnels lie beneath the Harrat Khaybar lava field – subterranean passageways which could contain bones and artefacts from ancient civilisations. Only 25km of these lava tubes have ever been explored - until now.\n\nSteve and the team start their journey at the ancient Nabataean city of Hegra, where secrets lie waiting to be uncovered.

Source: BBC 2