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Location DB > United States > Nevada > Boulder City > That Dam Tunnel > A Sunny Stroll > 11-26-2006-106.jpg 5 / 8   11-26-2006-106.jpg Description The small blocks of wood (cribbing) you see over the tunnel supports prevent rock from gaining momentum in case of a fall. Similar cribbing is often seen in hard rock mines. Controls Return to Main Location Page Return to Gallery Overview Edit this Gallery Edit this Picture Un-Subscribe this Picture Comments If you'd like to add a comment, please login or register. All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire. To contact webmaster, or click to email with problems or other questions about this site: UER CONTACT View Terms of Service | View Privacy Policy | Server colocation provided by Beanfield This page was generated for you in 546 milliseconds. Since June 23, 2002, a total of 740245387 pages have been generated.