Olavsvern
Tromsø Municipality, Norway · built 1967
Olavsvern (lit. 'Olav's protection/defense') is a decommissioned underground submarine base formerly used by the Royal Norwegian Navy located just outside the city of Tromsø. It is located along the European route E8 at the entrance to the Ramfjorden from the Balsfjorden.
Port data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).