Tunnels aren’t just used by Hamas to launch rockets or sneak fighters into Israel. They’re also a powerful psychological weapon that leaves Israelis with the potent fear of raids and kidnappings. That’s why the Israeli military is focusing its hunt underground.Tunnels aren’t just used by Hamas to launch rockets or sneak fighters into Israel. They’re also a powerful psychological weapon that leaves Israelis with the potent fear of raids and kidnappings. That’s why the Israeli military is focusing its hunt underground.