This list of longest tunnels ranks tunnels that are at least 13 km (8.1 mi) long. Only continuous tunnels are included. Pipelines, even those that are buried, are excluded. The longest tunnels have been constructed for water distribution, followed by tunnels for railways.
Espoo and Helsinki, Finland
18,200 m (11.309 mi)
Helsinki/Tallinn, Finland/Estonia
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a 20 km long three-metre diameter tunnel
This 20 km long tunnel contains one of the longest 400 kV XLPE cable circuits to be installed in Europe.
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