NG Earth Investigated - Cracking the Earths Crust (2008)

Take a speculative subterranean journey through Earth's crust. An imaginary remote sensing vehicle circles the planet, travelling over 55,000 kilometres from South Africa to the Atlantic Ocean as it uncovers some of the treasures the crust has to offer. Biochemist Esta Van Heerden discovers life in the crust in the Tau Tona gold mine in South Africa. Planetary geologist Jim Head explains his new theory to explain the enigma of how diamonds, normally found in Earth's mantle, make their journey up into the crust. And Peter Schultz, of Brown University fires a projectile from a 12 foot gun to investigate what happens to the crust when hit by an enormous asteroid.

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