What on Earth?

Sky History 2 HD

12:00 PM to 1:00 PM

Sunday 19 January

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A mysterious Saharan crater, seen from space, that hides a brutal past. Plus, strange craters in the English countryside, human sacrifice and the hunt for Bad King John's treasure. Also in this edition, satellites capture a bunker in the Arctic wilderness - the last hope for mankind in the event of a nuclear apocalypse