- This event has passed.
An event every year that begins at 12:00am on of March, repeating indefinitely
The Seikan Tunnel, which opened on 13th March 1988, is a railway tunnel in Japan, with a 23.3-kilometre long portion under the seabed making it both the longest and the deepest operational rail tunnel in the world. However, the Gotthard Base Tunnel in Switzerland will be longer when it opens to traffic in 2017 so remind Mash.ie to update this article! [Text/Image: Wikipedia]