Field Dispatch #00120 February 2026
BY Siknäsfortet
The 2026 Summer Season Is Underway
We welcome visitors from across Sweden and Europe. Fixed drop-in guided tours run during the open season.
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DECLASSIFIED MATERIAL
SELECT YOUR MISSION
CROSS-SECTION
4 UNDERGROUND LEVELS — 40 METERS DEEP INTO THE MOUNTAIN
Siknäsfortet — Cross-section view of the underground fortress
TIMELINE
1939 — 2025
1939–1945
World War II
Sweden maintains armed neutrality. Military planners recognize the vulnerability of Töre harbor — Sweden's northernmost deep-water port.
1957
Construction begins
In absolute secrecy, Swedish military engineers begin blasting into Hömyrberg mountain. Workers are sworn to silence.
1960
Fortress becomes operational
Four complete underground levels carved from solid rock. The fortress becomes a self-contained facility, armed with 15.2 cm guns from HMS Fylgia.
1983
The first submarine hunt
Swedish naval forces detect suspected foreign submarine activity in the Kalix archipelago. A massive submarine hunt is launched.
1987
Second submarine hunt
The incident repeats — among the most dramatic moments of Cold War tension in the Nordic region.
1990
HMS Spiggen II built
Sweden's only domestically built mini-submarine. 11 meters long, used for submarine hunt exercises.
1998
Fortress decommissioned
With the end of the Cold War and changing defense priorities, the fortress is decommissioned after over 40 years of service.
2013
Museum established
The Stiftelsen Siknäsfortet is established to preserve the fortress as a museum and increase knowledge about the Kalix Line.
2025
AI guide Stig launched
The museum introduces Stig, an AI-powered guide character — one of the first AI-integrated museum experiences in Scandinavia.
ONLINE
YOUR AI GUIDE
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.
HOBBY: COMIC ARTIST
In his free time, Stig draws comics about bunker life using AI. Explore his unique gallery and statistics from the summer season.
STIG'S PODCAST
COLD WAR STORIES, TOLD BY AN AI VETERAN
FM 40.0
LATEST EPISODE
Ep. 1: Under Berget
5 min 30 sec
Subscribe on
FM 40.0
FIELD DISPATCHES
REPORTS FROM INSIDE THE MOUNTAIN