See Terence Kleven, “Up the Waterspout—How David’s General Joab Got Inside Jerusalem,” BAR 20:04; and Dan Gill, “How They Met—Geology Solves Long-Standing Mystery of Hezekiah’s Tunnelers,” BAR 20:04 (also available on our Web site: www.bib-arch.org). See also Yigal Shiloh, “The Rediscovery of Warren’s Shaft,” BAR 07:04.