Transportation
Helsinki and Tallinn Agree to Build the World's Longest Underwater Rail Tunnel
The link would do more than shuttle travelers—it would effectively unify the two cities.
This week, Finland got a step closer to building the longest undersea rail tunnel in the world.
The cities of Helsinki and Tallinn, Estonia, have just signed an agreement to develop a rail line connecting the two capitals via a 92-kilometer (57.2 mile) tunnel beneath the Baltic Sea. If all goes to plan, the link could slash journey times: a trip that currently takes one hour and 40 minutes at its very shortest would last just 30 minutes.