Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

Season 49 · Episode 4 ·
The Core
For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4,000 miles beneath our feet, unlike anything we know on the surface. It is a planet buried within the planet we know, where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon. Horizon follows scientists who are conducting experiments to recreate this core within their own laboratories, with surprising results.
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Episode 4 of season 49 of Horizon: “The Core”. Aired 2011-08-31. Watch it online free on ZapFlix.