Work begins on world's deepest underground lab

(AP) -- Far below the Black Hills of South Dakota, crews are building the world's deepest underground science lab at a depth equivalent to more than six Empire State buildings - a place uniquely suited to scientists' quest for mysterious particles known as dark matter.

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<p><a href="http://www.physorg.com/news164915655.html">Work begins on world's deepest underground lab</a></p> <p>(AP) -- Far below the Black Hills of South Dakota, crews are building the world's deepest underground science lab at a depth equivalent to more than six Empire State buildings - a place uniquely suited to scientists' quest for mysterious particles known as dark matter.</p>