Which of the Earth's interior layers have been drilled and sampled and what are the deepest drilling projects on record?
Question asked by: knowitall
The lower section of the Earth's crust has been reached.
The possibility of the mantle is not far away.
Depths of over 4,500 feet have been reached.
This might be of interest to you - information on how deep in to the earths crusts humans have dug:
http://www.livescience.com/technology/050407_earth_drill.html
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deepest projects record drilling drilled earth's interior
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