Brenda, a 300ft-long boring machine weighing 800,000lbs has spent the last 16 months digging more than 200,000 tons of soil out from underneath Seattle in order to build a new subway tunnel.
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Brenda, a 300ft-long boring machine weighing 800,000lbs has spent the last 16 months digging more than 200,000 tons of soil out from underneath Seattle in order to build a new subway tunnel.
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