In order to maintain high fire power with the guns there was a need for large rooms for ammunition and comfort for the personnel who would be working during a long time in case of war. Sleeping quarters were provided together with kitchen/canteen, toilets and showers. The brain of the structure was the command central where all information passed and target instructions were ordered to the guns.
Around 30 fortifications of this type which were equipped with protection against shock waves and gasses were built in Sweden. The construction is cast in reinforced concrete with four floors and placed on springs which should reduce the vibrations in the bedrock at a nuclear attack.
The gun tower and defense system
The fortress main artillery were eight 15.2 cm naval guns in four double towers These were protected against ground attacks by an anti-aircraft platoon and by an infantry company, both locally recruited.
The towers were turned by hand and the barrels could be elevated separately. Fire control was run by the command central. Trenches and shelters were blasted down in the bedrock all around the fortress.
The structure, tower 1
The stairs down to the structure goes to a shock tunnel. Here with a 90O angle the entrance is situated behind a several decimeter thick shock wave door of steel. The building also has over pressure to prevent gasses and poisoness air to enter and all pumped in air is filtered.
Before entering the tower all persons must pass through a gas lock equipped for NBC sanitation (nuclear, biological and chemical). Behind that is a modern restaurant kitchen with a dining room for around 20 persons. The meals were eaten in spells so the preparedness could be maintained.
All of the second floor was used as sleeping quarters for the battery personnel – around 80 officers and soldiers. All slept in three-stored beds and the only dfference was the size of the rooms. Today, after the building of a emergency exit, the association is allowed to have 30 persons sleeping in the building.
On next floor there are two ammunition store rooms, one for 2300 15, 2 cm projectiles and one for 2580 propellants. This ammunition is of course wasted today and the two rooms are now museum halls. Inside these is the loading room where projectiles and propellants were automatically raised inside ”the stem” about 12 m up to the gun.
At the very bottom of the building is the command central with equipment for fire command, signals central and a telephone exchange. Beside there is also a sleeping quarter for the staff (today a conference room) and a small room where the battalion commander could work and sleep.