In 1980 I walked through Hezekiah’s tunnel. It was an astonishing stroll. We made our way through the darkness with the uncertain aid of flashlights and sang hymns about light: “Lead Kindly Light,” “The Lord Is my Light,” “There Is Sunshine in my Soul Today,” and so on. The tunnel is not straight. It bends and angles many times through nearly 1,800 feet. The Jews built the tunnel to bring water into the city as a hedge against an Assyrian siege.