10 to 30
Number of main tunnel shafts thought to run under the Gaza-Egyptian border at any one time
$100 million
Amount of aid the U.S. Congress withheld in 2008 from Egypt until the country stepped up efforts to stop smuggling through the tunnels
$23 million
Amount of annual U.S. military aid to Egypt that the country spends on advanced detection equipment, including sensors and remote-controlled robots, to deter and halt smuggling
Source: Los Angeles Times
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