To stress how prolific tunnels are - if I drive from my home near Aalesund on the northwestern coast to the family seat at Voss (a bit inland from Bergen), some 360km/220mi or so, more than 1/4 of that distance is in tunnels. Can't remember how many, but dozens.

I think if you drive just the Bergen-Voss-Nordheimsund-Bergen circuit (some 200km?) that alone is 60 tunnels, and many of them are longer than what most countries have.