6 June / 13-14 June / 24 June-30 August
Closed Mondays and Tuesdays
A tour lasts about 35–60 minutes.
No pre-booking is required during the open season for the fixed tour times.
SELECT YOUR MISSION
4 UNDERGROUND LEVELS — 40 METERS DEEP INTO THE MOUNTAIN
Siknäsfortet — Cross-section view of the underground fortress
1939 — 2025
Sweden maintains armed neutrality. Military planners recognize the vulnerability of Töre harbor — Sweden's northernmost deep-water port.
Four artillery batteries are built on the Siknäs peninsula to defend Töre harbour and delay an advance towards Boden.
Each battery has a twin turret with 15.2 cm guns from HMS Fylgia, rooms on three or four floors, backup power and its own well.
Swedish naval forces detect suspected foreign submarine activity in the Kalix archipelago. A massive submarine hunt is launched.
The incident repeats — among the most dramatic moments of Cold War tension in the Nordic region.
Sweden's only domestically built mini-submarine. 11 meters long, used for submarine hunt exercises.
After the last wartime unit exercise in 1990, batteries 3 and 4 leave the wartime organisation in 1992. Batteries 1 and 2 follow in 1998.
The Siknäsbatteriet ownership group buys the installation in the autumn and makes it available to the museum association.
After the association’s spring refurbishment, the museum opens on 1 July. That autumn, the owners donate their shares to establish Stiftelsen Siknäsfortet; the association continues to run the museum.
The museum introduces Stig, an AI-powered guide character — one of the first AI-integrated museum experiences in Scandinavia.
Hej! My name is Stig.
I served at this fortress for 15 years during the Cold War.
Well... let's say I did. The details are still classified.
Ask me anything about the fortress, submarines, or life underground.
In his free time, Stig draws comics about bunker life using AI. Explore his unique gallery and statistics from the summer season.
COLD WAR STORIES, TOLD BY AN AI VETERAN
LATEST EPISODE
Ep. 1: Under Berget
5 min 30 sec
Subscribe on
Recent reports from inside the mountain
Report from yesterday: National Day opening at Siknäsfortet turned out just as one hopes — many visitors, a warm atmosphere, and a mountain that for once did not need to keep quiet.
Read more
We welcome visitors from across Sweden and Europe. Fixed drop-in guided tours run during the open season.
Read more
