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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.
The deepest point in Krubera Cave, at the depth of 2,197 m, is located only 59 m above the sea level. Thus one could assume that this cave can not go much deeper than this. Research though shows that caves here could continue well under the sea level. This is testified by amazing undersea springs deep in the Black Sea.