Every tunneling machine needs its cutting tools replaced every now and then. But the challenge is keeping a giant machine sharp while a wall of waterlogged earth looms in front. Welcome to the world of hyperbaric interventions, where crews used compressed air to stabilize the ground and safely complete this high pressure work. This video takes you 200 feet underground for a rare look at hyperbaric work inside Seattle’s SR 99 tunneling machine, Bertha. [Source: WSDOT YouTube Channel. Image: YouTube]
Related Articles
Contractors battle to extract TBM after silt breaches tunnel
February 28, 2011
rockman
Project Related
Comments Off on Contractors battle to extract TBM after silt breaches tunnel
NYC Subway Tunneling Begins Under Second Avenue, TBM Launched
May 25, 2010
rockman
Project Related
Comments Off on NYC Subway Tunneling Begins Under Second Avenue, TBM Launched
Plan for Bertha Repair Submitted, Archaeological Surveys Underway
March 20, 2014
rockman
Project Related
Comments Off on Plan for Bertha Repair Submitted, Archaeological Surveys Underway