One of the 20th century's most remarkable underground tunnels was engineered to endure powerful earthquakes while linking two ...

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. The ...

The tunnel connects two beautiful islands and is even longer than the Channel Tunnel.

The Seikan Tunnel in Japan is the world's current longest undersea tunnel used by bullet trains. Spanning 53.85 kilometers (33.46 miles), it includes a 23.3-kilometer (14.5-mile) section beneath the ...