What on Earth?

Sky History 2

12:00 PM to 1:00 PM

Sunday 20 April

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Experts investigate the startling mysteries captured by satellites orbiting the Earth. In this edition, the mystery undersea disks that scientists still can't explain, a sci-fi structure the size of a town covered in a labyrinth of passageways, a ship stranded on the island that time forgot and a mystery Russian military compound