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Another recent datapoint is the tunnel between Germany and Denmark has a budget of €10 billion for 18km so €0.55 billion/km. Projects like these tend to have bu

Another recent datapoint is the tunnel between Germany and Denmark has a budget of €10 billion for 18km so €0.55 billion/km. Projects like these tend to have budget overruns, so maybe €15 billion? That'd be €0.85 billion/km. But that's completely ignoring any geological differences of course, so not very realistic.

Archelaos 5y ago
> But that's completely ignoring any geological differences of course, so not very realistic. I could imagine that there are several other features of a tunnel that might affect its price considerably: cross-section dimension, number of pipes, technique of construction, security installations, ventilation, the type of use (rail, automotive, both), ... For example, the Fehmarnbelttunnel/Femern Bælt-tunnelen you mentioned will consist of four pipes for both, rail and automotive, and is not drilled but built out of prefabricated modules (42m x 9m x 217m) made of concrete placed in a trench on the seabed and then covered with stones and sand.[1] [1] Source: https://de.wikipedia.org/wiki/Fehmarnbelttunnel https://de.wikipedia.org/wiki/Fehmarnbelttunnel (in German)