Egypt is building a saltwater curtain in its frontier with Gaza. The idea is to stop underground traffic by wetting the sand and collapsing the tunnels. Palestinian sources describe the project (pic) consisting in a 10 km long main line with a sea intake, and every 30 - 40 meters a 20 - 30 m long perforated vertical pipe. They dont need to operate it all the time, it is enough to "irrigate" the soil once a while to turn tunelling dangerous or impossible. The Palestinians say that the pipe will be be in their side of the border, increasing the salt content of their aquifer but less so in the Egyptian side, protected by a 35 m deep iron wall.
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