Scientists plan to drill all the way down to the Earth's mantle

British scientists plan on drilling 5 miles deep to earths mantle to take rock samples from the mantle. there would only be a few problems, the atmospheric pressure and the degrees farenheit, both would rise dramtically the further you go. the benefits of what they are trying to do would be the un-tainted mantle sample, instead of the corrupted samples volcanoes bring up from the mantle.

http://www.physorg.com/news/2011-03-scientists-drill-earth-mantle.html