The pipe that stopped drilling in Seattle was 10 years old, not 100. It was meant to measure the seismic stability of the viaduct that was eventually removed. T

The pipe that stopped drilling in Seattle was 10 years old, not 100. It was meant to measure the seismic stability of the viaduct that was eventually removed. The tunneling firm was found to be aware of the pipe and liable for delays. https://en.m.wikipedia.org/wiki/Bertha_(tunnel_boring_machine)#Damage_to_cutterhead_and_two-year_delay https://en.m.wikipedia.org/wiki/Bertha_(tunnel_boring_machin...