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How it all Holds up (or Doesn't)

The Central Artery Tunnel Project has changed Boston's driving patterns in recent years, and the accident that killed Melina Del Valle on Monday night is now exposing commuters to what makes up the tunnel, such as tiebacks, girders, beams and slabs.

Shannon Mullen reports on the Big Dig's construction.

This program aired on July 12, 2006. The audio for this program is not available.

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