2011-01-22 Reid Pipp in Tunnel Diablo Mountains Hunter and Sage Published November 4, 2013 - size: 1350 × 1800 in 2011-01-22 Reid Pipp in Tunnel Diablo Mountains Hunter and Sage ← Previous Next → Hunter, Reid and Sage tunneling in Diablo Mountains Read More... This tunnel is 1/2 a mile long and took 38 years to dig. It is located in the Diablo Mountains.