SEATTLE — Sound Transit officials are breathing easier since a boring machine successfully tunneled under Interstate 5 in downtown Seattle.
The Seattle Daily Journal of Commerce reports the machine chewed its way Tuesday night just 15 feet below the lanes of traffic.
Officials said boring under the freeway was one of the riskiest parts of the $1.9 billion University Link project. Earlier this fall machines completed a tunnel under the Montlake Cut without flooding.
The three-mile light rail line between downtown Seattle and the University of Washington is expected to open in about five years.
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