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A comment on Drone footage of Seattle's new 57 foot SR 99 tunnel [video]. Parent comment

Re:Drone footage of Seattle's new 57 foot SR 99 tunnel [video] by mulmen on Saturday October 21, 2017 @04:00PM (#15523343)
There has to be more to it than just homogenous ground composition. Surely drilling into granite is harder than clay or something? Also my understanding was that the SR99 tunnel is through both fill and clay.

http://www.wsdot.wa.gov/Projects/Viaduct/About/Tunneling

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Re:Drone footage of Seattle's new 57 foot SR 99 tunnel [video] by pygy_ on Saturday October 21, 2017 @04:18PM (#15523411)
I may not have used the best phrasing:

For a given tunnel length and ground composition, the cost is proportional to the area of the cross section.

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