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Magma in Earth's Mantle Forms Deeper Than Once Thought. Study simulating pressures in mantle beneath the ocean floor shows that rocks can melt at depths up to 250 kilometers. When magma reaches Earth's surface and erupts from a volcano, it becomes lava.
[â]iorgfeflkdBiophysics 263 points264 points265 points 3 years ago (129 children) The deepest we have dug is the Kola Superdeep Borehole in Russia which went about 12 km deep. There have also been some oil wells that have gone similarly deep.The deepest known cave is the Voronya cave which is about 2 km deep. permalink.