This can be answered in two ways.
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The deepest manmade hole in the Earth is the Kola superdeep borehole. It went 7.5 miles deep. See the related link for more information.
A fault.
a type of rock that forms when magma cools and hardens very slowly deep in earths crust...
Earth's plates or crust can cause earthquakes, volcanic eruptions, and the formation of mountain ranges due to tectonic plate movements and interactions. Subduction zones can also lead to the formation of deep ocean trenches and volcanic arcs.
No, scientists have not yet drilled into the Earth's lower mantle. This region of the Earth is located about 400 to 1,800 miles below the surface, making it extremely difficult to reach with current drilling technology. The deepest hole ever drilled, the Kola Superdeep Borehole in Russia, only reached about 7.5 miles deep.
No, humans have never gone beneath the Earth's crust. The deepest humans have ever drilled into the Earth is about 7.5 miles (12 kilometers) deep, which is a tiny fraction of the thickness of the Earth's crust. Going deeper would require advanced technology that does not exist yet.