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Source: http://www.jpost.com/Israel-News/Silent-tunnel-neutralization-517658
More Details on Israel's New Underground Barrier
(Jerusalem Post) Anna Ahronheim - To build the new underground barrier opposite Gaza, the IDF is using a German hydromill, a powerful drill that can destroy anything that crosses its path. The excavated area is then filled with bentonite, a clay-like mineral that expands and turns into an adhesive when it comes into contact with water. When the bentonite comes into contact with a tunnel, the bentonite drains into it, effectively destroying it.