http://en.wikipedia.org/wiki/Alaskan_Way_Viaduct_replacement_tunnel
Although its nowhere near the scale of the Big_Dig project in Boston, its still a big project.
http://mynorthwest.com/11/2367894/Know-before-you-go-Good-timing-for-closures-on-SR-99-Montlake-Bridge
http://westseattleblog.com/2013/09/traffic-alert-highway-99-blocked-at-battery-street-tunnel
http://en.wikipedia.org/wiki/Downtown_Seattle_Transit_Tunnel#Stations,
http://en.wikipedia.org/wiki/Central_Link#Stations,
http://en.wikipedia.org/wiki/Beacon_Hill_(Link_station)
http://www.boston.com/beyond_bigdig,
http://www.wbur.org/2012/07/12/big-dig-effect,
https://www.youtube.com/watch?v=DkZSQS7lpHE,
http://science.howstuffworks.com/engineering/structural/tunnel5.htm
http://www.boston.com/beyond_bigdig/cases/sanfrancisco/index.shtml
