ITV - Arthur C. Clarke's Mysterious World (1980) Part 7 The Great Siberian Explosion

Arthur C. Clarke's Mysterious World
Do U.F.O.s or the Loch Ness Monster really exist? Did ancient civilisations possess unsuspected scientific know-how? Can we believe the reports of the Abominable Snowman or the Great Sea Serpent? How is it that fish, frogs and seeds can fall from a clear blue sky? In this series, Arthur C. Clarke, author of 2001: A Space Odyssey investigates these and many other intriguing mysteries. This much sought-after show debunks myths and legends about some of the planet's strangest phenomena, presenting us with fascinating truths about humanity and the world in which we live. Originally broadcast on ITV in 1980, In January 2008 the original series was released on DVD in the UK by Network and Granada. It features all of the 13 original episodes unedited and remastered in Digital Quality.

Part 7: The Great Siberian Explosion
This episode deals with a certainty: The cataclysmic Tunguska explosion of June 30, 1908. No one questions the fact that it occurred. Still to this day there is uncertainty as to the true nature of the incident and its possible implications concerning the expectations should such an event again take place. The subject is deeply discussed, reviewing all available information and Clarke addresses the significance of the theories presented

Arthur C. Clarke's Mysterious World (Wikipedia)

ZDF - Doomsday In Tunguska (2009)