Railway tunnel construction shortens the route length by allowing rail lines to pass through natural obstacles. These are particularly prevalent when it comes to passages and tunnels through mountains ...

The first section of the world's longest underwater road and rail tunnel has been constructed, putting the project on track for completion by the end of the decade. At 18,000 meters, The Fehmarnbelt ...

Workers drill during construction of the Flathead Tunnel in early June, 1968. (Mel Ruder/Hungry Horse News file photo) Conditions inside the Flathead Tunnel during construction. (Mel Ruder/Hungry ...

It's not on the scale of Boston's Big Dig, but the Bremerton Tunnel Project nevertheless is poised to make a significant impact on traffic in this waterfront city across Puget Sound from Seattle.