More than 150 locations across the Boston tunnel system were inspected over the weekend after a large chunk of concrete fell from the roof of the Prudential Tunnel during the Friday afternoon commute.

MassDOT crews have inspected dozens of locations across the tunnel system after concrete debris fell from the ceiling of a Boston tunnel ... of freeze-thaw action. Water had infiltrated the ...

Metrowest Water Supply Tunnel - 17.6 miles long, 200-500' below ground. The tunnel was started in 1996 and stretches from Marlborough to Newton.

A former worker at the Stoughton Water Department has pleaded guilty to tampering with the town's drinking water supply.