What on Earth?

Blaze (Freeview)

1:05 PM to 2:05 PM

Friday 11 October

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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