6 June / 13-14 June / 24 June-30 August
Closed Mondays and Tuesdays
A tour lasts about 40-60 minutes.
No pre-booking is required during the open season for the fixed tour times.
Tours do not start before, between, or after these times unless a special group visit has been arranged.
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.
In absolute secrecy, Swedish military engineers begin blasting into Hömyrberg mountain. Workers are sworn to silence.
Four complete underground levels carved from solid rock. The fortress becomes a self-contained facility, armed with 15.2 cm guns from HMS Fylgia.
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.
With the end of the Cold War and changing defense priorities, the fortress is decommissioned after over 40 years of service.
The Stiftelsen Siknäsfortet is established to preserve the fortress as a museum and increase knowledge about the Kalix Line.
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
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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.
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We welcome visitors from across Sweden and Europe. Fixed drop-in guided tours run during the open season.
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