Helsinki-to-Tallinn Tunnel

The Helsinki–Tallinn 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 kilometres (50 mi), which would make it 40% longer than the current longest railway tunnel in the world, the 57 km -long Gotthard Base Tunnel in Switzerland.

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Wikidata
Helsinki-Tallinn railway; Helsinki-Tallinn tunnel; Tallinn-Helsinki tunnel; Talsinki Tunnel
international tunnel, undersea tunnel, railway tunnel, proposed tunnel, 

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Location: 59.8061, 24.8181, KML, Cluster Map, Maps,
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  Helsinki-to-Tallinn Tunnel ⓘ
  planned undersea rail connection between Finland and Estonia

Frameless

Type	Subtype	Date	Description	Notes	Source
site	tunnel		Helsinki-to-Tallinn Tunnel	proposed tunnel, international tunnel, undersea tunnel, railway tunnel	Wikidata