Rescue device can also detect tunneling

Israel’s Elpam Electronics originally developed the geophone to find people trapped under the debris of collapsed buildings. Now it is updating the device to locate the sound of someone crawling up to 10 meters below the surface of the ground.
http://www.timesofisrael.com/using-seismic-vibrations-israeli-firm-aims-to-detect-gaza-tunnels/

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