Unlocking W.D. Gann’s ‘The Tunnel Thru the Air’ By Pauline Novak-Reich | October 21, 2013 W.D. Gann is well-known among trading gurus. However, we know little about the thought process behind his approach. Some believe Gann’s 1920s science-fiction novel, “The Tunnel Thru the Air,” contains the hints we seek.