Unseen beneath Lisbon's traffic-clogged streets, huge tunneling machines burrow back in time.
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The station was built using a combination of cut-and-cover construction and tunneling machines.
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Workers dug deep using tunneling machines.
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He invented a tunneling machine which was accidentally credited with work actually carried out by The Engineer ".
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Attempts to speed the tunneling machines have so far failed to make up for lost time or cut costs.
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The lots are being used as staging areas for the tunneling machines during the construction of the Eglinton Crosstown line.
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Army engineers believe the tunnels were dug using a small tunneling machine and took anywhere from a week to a month to complete.
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In August, the boulevard was shut down temporarily and construction work stopped for four months when ground subsided 9 inches above a tunneling machine.
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The first tunneling machine was expected to be assembled in April 2015 and the driving of the tunnel was expected to start in October 2015.
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That means not watching the closed-circuit pictures of your esophagus, but you don't want to be watching if the doctor strays off course like that tunneling machine under Eastlake Avenue.
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