The collapse of a Himalayan highway tunnel in Uttarakhand, India, trapped 40 workers, sparking a challenging rescue operation. The incident occurred on November 12, 2023, and the workers are reported to be in good health, being supplied with food, water, and air through pipes. The affected portion of the tunnel was about 40 meters long, and rescue efforts were hampered by the continued collapse of the roof of the tunnel as they attempted to install a steel casing large enough for the workers to crawl through. The 4.5-km (3-mile) tunnel is being constructed along the Char Dham Hindu pilgrimage route as part of a major road-building initiative by the Indian government. Source: Reuters.
In keeping with our theme of rising costs on tunnel projects, the Brightwater sewage-treatment plant and treated waste pipeline project in King County Washington (Seattle area) is now up to at least $1.84 billion according to the lead consultant on the project. The treated waste pipeline is 13 to 14-miles long and at depths of 40 to 440-ft! It is being constructed nearly entirely by TBM. One source of delay was due to a tunneling subcontractor not being able to get parts (ball bearings?) because they were all being requisitioned by the US War Department for use in military equipment in Iraq and Afghanistan. Click through for information sources and links.