'Bertha' Still Stuck In Her Tunnel Under Seattle

In Seattle, an underground mystery has halted the digging of a new highway tunnel underneath downtown. The world's largest tunneling machine ground to a halt two weeks ago, and engineers are still trying to figure out why.

Source: http://www.npr.org/2013/12/22/256275571/bertha-still-stuck-in-her-tunnel-under-seattle?ft=1&f=1003

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