At least 10 operatives of the Izzedine al-Qassam Brigades, the militant arm of the Islamist movement Hamas, have died since the middle of January while building tunnels underneath the Gaza Strip near the border with Israel.
In the war of 2014, Hamas mounted assaults on Israeli forces through a labyrinth of tunnels.
Israel is training its soldiers in underground combat and buttressing its defenses.
Israeli security officials recently asked the Knesset for funding to develop and construct a system to detect and destroy cross-border tunnels.
Known as “The Obstacle,” the system is being funded in part by the U.S. government. Read more at the Wall Street Journal.