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The American Association for the Advancement of Science (AAAS), published the article, Tapping Tesla to Save Trapped Miners in their journal Science. The article details how Lockheed Martin engineers used a concept Tesla tinkered with in the 1890s to create a phone that can send a signal through 500 meters of solid rock.
The MagneLink Magnetic Communication System is a refrigerator size magnetic generator that creates a low energy magnetic field that can send a signal just like the electromagnetic waves of cell towers. The magnetic only signal goes through the ground where electricity conducting rock and clay dissipates the cellular signal.
The team focused on a concept developed over a century ago by Nikola Tesla. The noted pioneer in electricity and radio had shown that a magnetic wave generator could be used for wireless communications.