Seattle's bored tunnel would be world's widest

06/23/2010 | Seattle Times, The

Seattle is gearing up to drill the world's widest bored tunnel: a 1.7-mile, 13-month mission to cut through varying soils, boulders and groundwater. The boring machine that will cut the Highway 99 tunnel is 56 feet across and is expected to cost between $60 million and $80 million.

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Seattle Times, The

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