The Helsinki–Tallinn Tunnel (also known as FinEst or Talsinki tunnel) is a proposed undersea tunnel that would span the Gulf of Finland and connect the Finnish and Estonian capitals by train. The tunnel's length would depend on the route taken: the shortest distance across would have a submarine length of 80 km (50 mi), which would make it 40% longer than the current longest railway tunnel in the world, the 57 km (35 mi)-long Gotthard Base Tunnel in Switzerland.
The Helsinki–Tallinn Tunnel (also known as FinEst or Talsinki tunnel) is a proposed undersea tunnel that would span the Gulf of Finland and connect the Finnish and Estonian capitals by train. The tunnel's length would depend on the route taken: the shortest distance across would have a submarine length of 80 km (50 mi), which would make it 40% longer than the current longest railway tunnel in the world, the 57 km (35 mi)-long Gotthard Base Tunnel in Switzerland.
Source: Wikipedia "Helsinki–Tallinn Tunnel" · CC BY-SA 4.0
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