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  • As Donald Trump calls for wall on Mexican border, smugglers dig tunnels

    The New York Times - 09/01/2016

    Carey M. Rappaport, a professor of electrical and computer engineering at Northeastern University in Boston, said the depth of many tunnels also posed a technological challenge. Some can be as deep as 90 feet, beyond the reach of most ground-radar devices and sensors.

    “Soil is very good at keeping secrets,” said Mr. Rappaport, who has also worked with the United States and Israeli governments on tunnel-detection methods.

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