The areas are sparsely populated, and the earthquake was 62 miles beneath the Earth's surface.

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All those miners were rescued, pulled one by one from hundreds of meters beneath the Earth's surface with a specially designed capsule.

CNN: Peru: Nine miners rescued after six days underground

It comes from a garden wholesaler, which provides the high quality soil, taken deep beneath the earth's surface -- 10 meters down, in fact.

CNN: Tokyo restaurant dishes up the dirt

The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.

FORBES: Magazine Article

Geothermal systems gather energy present beneath the earth's surface, where the temperature averages 55 degrees (higher in Texas, lower in North Dakota), and concentrate it to provide space heating.

FORBES: Magazine Article

Unless it somehow managed to burrow a very long way down before exploding, such a weapon detonated beneath the earth's surface would throw up huge amounts of radioactive debris, a danger to all.

ECONOMIST: Why some weapons are best left unexplored