While Norway is an amazing country in many aspects, the amount of oil owned by a state company puts it in a rather unique position.
It's not really common. They only have one tunnel that's 24.5km ( https://en.wikipedia.org/wiki/List_of_tunnels_in_Norway ) and it's not under the sea. The remaining are 10km or shorter.
The longest undersea tunnel is 8.9km and it goes to a city with a population of 8,215. It goes to an entire island though, so a few more people than that benefit.
Your overall point is completely right, but might as well get the facts straight, so people can compare and don't recite wrong information.
Norway doesn't actually show up much on the list of longest tunnels: https://en.wikipedia.org/wiki/List_of_longest_tunnels
Creating a national investment fund from the oil bonus seems a far better choice than continuing as usual, or using it to pay for tax cuts (1980's UK).
When the oil runs out, or is considered too damaging to use any more, the infrastructure will still be there, and so will the fund.
https://www.ft.com/content/99680a04-92a0-11de-b63b-00144feab...
State wealthfare fund and research in various techniques to minimize pollution from oil production.