Gaza is riddled with tunnels. Some are for smuggling; others are for transporting weapons; others are for hiding or ambushing Israeli troops. The crucial passageways— 400 to 600 , by recent estimates—run from Gaza to Egypt, circumventing the closed border. That's how Hamas gets parts and material for the missiles it fires into Israel. Any deal to end the current fighting has to include " an effective blockading " of that border, "with supervision and follow-ups," according to Israel's prime minister. To stop the war—and to keep it stopped—you have to figure out how to stop the tunnels.
But how? Here are some of the options.
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