Beneath the wheat and watermelon fields surrounding this farm community just outside the Gaza Strip lies a threat that helps explain the overwhelming public support in Israel for the war against the Palestinian militant group Hamas.

A little over a week ago, assailants dressed in Israeli military uniforms clambered out of an underground passageway about halfway between this hamlet of 400 or so people and a neighboring kibbutz, Nir Am. Israeli troops killed nine of them, but not before the attackers killed four soldiers.

The specter of such assaults via a large and sophisticated network of subterranean passageways has profoundly shaken Israelis long accustomed to a different threat from the coastal strip, that of rocket and mortar fire. Four such infiltrations have taken place since the start of the Gaza offensive, killing at least 11 Israeli soldiers and haunting the collective psyche.

“From this, you can’t protect yourself,” said Ruti Sheves, 64, who has lived in Kibbutz Erez for 40 years. “You don’t have a shelter where you can run and be safe. You can’t be safe from this.”

Troops operating in and near Gaza have tracked 36 tunnels with dozens of access points, Deputy Foreign Minister Tzachi Hanegbi said Wednesday, as the Israeli offensive in Gaza entered its fourth week. Miles of passageways, many stocked with weapons and reinforced against explosions from above, pass near or directly beneath schools, mosques and hospitals, threading their way under some of the most densely populated terrain on Earth.

Read the article in full at the LA Times.