Yeah, this is why there is constant talk of a tunnel connecting Helsinki and Tallinn and/or Stockholm and Turku. The distance is much more than the channel tun

Yeah, this is why there is constant talk of a tunnel connecting Helsinki and Tallinn and/or Stockholm and Turku. The distance is much more than the channel tunnel, and the population that would use it is much less, but it might still be feasible simply because it could be routed almost entirely through hard granite. In Helsinki a lot of the kind of infrastructure that is placed above ground basically everywhere else is being dug underground simply because the cost of digging is less than the cost of land, and so everything that doesn't need windows gets sunk in the rock. And when you dig, you actually get to recoup some of your expenses by selling the stone you quarry...