DECLASSIFIED MATERIAL
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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.
TIMELINE
1939 — 2025
World War II
Sweden maintains armed neutrality. Military planners recognize the vulnerability of Töre harbor — Sweden's northernmost deep-water port.
Construction begins
In absolute secrecy, Swedish military engineers begin blasting into Hömyrberg mountain. Workers are sworn to silence.
Fortress becomes operational
Four complete underground levels carved from solid rock. A self-contained facility capable of withstanding nuclear attack.
HMS Fylgia guns installed
Artillery pieces from the decommissioned coastal defense ship HMS Fylgia are installed. These 15.2cm guns could cover Töre harbor and the approaches from the sea.
The first submarine hunt
Swedish naval forces detect suspected foreign submarine activity in the Kalix archipelago. A massive submarine hunt is launched.
Second submarine hunt
The incident repeats — among the most dramatic moments of Cold War tension in the Nordic region.
HMS Spiggen II built
Sweden's only domestically built mini-submarine. 11 meters long, used for submarine hunt exercises.
Fortress decommissioned
With the end of the Cold War and changing defense priorities, the fortress is decommissioned after over 40 years of service.
Museum established
The Stiftelsen Siknäsfortet is established to preserve the fortress as a museum and increase knowledge about the Kalix Line.
AI guide Stig launched
The museum introduces Stig, an AI-powered guide character — one of the first AI-integrated museum experiences in Scandinavia.
CROSS-SECTION
4 UNDERGROUND LEVELS — 40 METERS DEEP INTO THE MOUNTAIN
Siknäsfortet — Cross-section view of the underground fortress
STIG'S PODCAST
COLD WAR STORIES, TOLD BY AN AI VETERAN
LATEST EPISODE
Ep. 12: The Night We Heard the Submarine
18 min
Ep. 12The Night We Heard the Submarine
Ep. 11Christmas 40 Meters Underground
Ep. 10The Fylgia Guns: From Warship to Mountain
Ep. 9Why Töre? The Strategy Behind Sweden's Secret Fortress
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FIELD REPORTS
VISITOR OBSERVATIONS
“Walking through the blast tunnel gave me chills. You can feel 50 years of history in the walls.”
— Anna K., Stockholm
“My kids loved the submarine. Stig answered all their questions — they didn't want to leave!”
— Familjen Andersson, Kalix
“As a military history enthusiast, this is the most authentic Cold War experience I've had in Scandinavia.”
— Thomas W., Berlin
STIG'S DISPATCH
Monthly briefings from 40 meters underground. Cold War stories, event updates, and exclusive content.
Become a member of Föreningen Siknäsfortet — 100 kr/year. Support the preservation of Cold War history.