A week ago - December 6th - having just achieved the 1,000 foot mark, Bertha, so named to honor the female mayor of Seattle, Bertha Landes, has nosed into a mysterious circumstance, unable to continue forward movement.
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designed to burrow through soft under ground conditions containing water under pressure, such as loose sedimentary deposits with large boulders and a high water table.
Ballard Diving & Hyperbaric Services may be deployed into the cutting face. Bertha can only back up about 18", allowing a crew to enter the void and determine was is causing the blockage.
(As an example, pressure measured in a South African gold mine, two miles below the surface, approached 12,000 pounds per square inch!)
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It is riveting to see the results of Bertha's progress thus far!
• Some Assembly Required
• Some Assembly Required - Part Two
• Some Assembly Required - Part Three
• Off in a Cloud of Dust!