Driving into an underwater tunnel can catch you off guard. One moment you’re in open daylight, and then the road dips and you’re enveloped by concrete, headlights flickering off tiled walls. The sound ...

Every day, long-haul truckers and commuters pass through the George Wallace Tunnel, briefly slipping away from daylight and 40 feet underwater, until reemerging into downtown Mobile, Alabama. Since ...

This video explores the construction of the Fehmarnbelt Tunnel, an 18 km long underwater tunnel in the Baltic Sea that has ...

The world’s longest and deepest undersea road tunnel is being built in Norway, intended to cut travel time between major cities and become part of a ferry-free highway along its western coast.