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English: This piece of equipment, named a Jumbo Rig, was designed to speed up the Hoover Dam's tunnel drilling process. Built on the back of a 10-ton truck, 24 to 30 drills could be operated at once.
Date 03:47, 20 June 2010 (UTC)
(20 June 2010 (original upload date))
Source Transferred from en.wikipedia; transferred to Commons by User:NortyNort using CommonsHelper.
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Author Bureau of Reclamation. Original uploader was NortyNort at en.wikipedia
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