What On Earth?

Satellite images could explain desert ruins rumoured to be an entrance to an underworld and a city-sized chunk of ice suddenly disappears in Antarctica.

About the programme: Satellites orbit Earth at 17,000 miles an hour, capturing images of our world that are breathtaking, but some are bizarre. This unique perspective reveals objects that seem to make no sense & phenomena that defy explanation. Such images force the question, what on Earth is that?

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