I think your translation may be a little off there joćo paulo.

I think it may be hundreds of feet, not hundreds of miles.

From the following website:

http://www.livescience.com/technolog...rth_drill.html

The Earth's radius is about 4,000 miles (6,400 kilometers). The main layers of its interior are in descending order: crust, mantle and core.

The crust thickness averages about 18 miles (30 kilometers) under the continents, but is only about 3 miles (5 kilometers) under the oceans. It is light and brittle and can break. In fact it's fractured into more than a dozen major plates and several minor ones. It is where most earthquakes originate.
But still, cool information know.