Argument: Seattle tunnel could easily be cheaper than predicted
- Debate: Seattle deep-bore tunnel - pro argument.
Laura Kaliebe. "Bore, Baby, Bore? Sightline Report Compares Cost Overruns of Seattle-Area Tunnels." Northwest Hub: "The cost estimate for the bored-tunnel alternative includes $420 million of “provisional risk cost,” which accounts for potential changes to scope, mitigation, right of way, issues during construction, risk (and opportunity), events and escalation of costs, according to the Washington Department of Transportation’s website. “Comparable tunnels recently completed around the world have been delivered for significantly less than the cost estimate per lane mile of the proposed SR 99 bored tunnel,” the website notes."