Named two-level coastal-artillery rock battery beneath the 22-hectare island of Storholmen. The source directly reports 5,000 m² / 53,820 ft² underground area, 1,200 m of tunnels, three 15.2 cm gun wells, filtered protective ventilation, command and fire-control rooms, power, water, wastewater treatment, accommodation and workshops. It also gives alternative mid-1990s decommission estimates, but no original construction cost.

area_m2: value: 5000 m² / 53,820 ft² | scope: focal SL1 underground facility | note: Reported underground area. | tunnel_length_m: value: 1200 | unit: m | scope: focal SL1 tunnel network | note: Reported total tunnel length; cross-sections are absent. | portals: value: 2 | unit: main portals | scope: focal SL1 | note: The article refers to both main entrances; several smaller emergency exits also existed, but their count is not stated. | shafts: value: 3 | unit: gun shafts/wells | scope: focal SL1 | note: One for each reported 15.2 cm gun; additional shafts to command and measurement positions are reported without a total count. | inner_structure: value: two-level central facility connected by rock galleries | scope: focal SL1 | note: Includes command, operations, service, accommodation and utility spaces. | levels: value: 2 | unit: floors | scope: central facility | note: Directly reported. | other: value: 3 | unit: 15.2 cm guns | scope: focal battery | note: Mounted in massive gun wells.; value: 8 | unit: planned measurement stations | scope: battery-wide system | note: Two were initially radar-equipped.; value: 300 | unit: persons | scope: wartime exercise strength | note: Operational exercise strength, not design occupancy.

amount: SEK 2,000,000–2,300,000 | year: mid-1990s | basis: decommission estimate | scope: Option to seal entrances and leave much equipment; additional gun-demolition cost excluded.; amount: SEK 2,650,000–3,050,000 | year: 2020 | basis: publisher-stated equivalent | scope: Article's 2020 equivalent for the limited sealing option; conversion method is not stated.; amount: SEK 8,000,000 | year: mid-1990s | basis: decommission estimate | scope: Option to remove and dispose/recycle equipment and hazardous material before sealing.; amount: SEK 10,600,000 | year: 2020 | basis: publisher-stated equivalent | scope: Article's 2020 equivalent for the full-removal option; not construction cost.

SLC, SPL, SBC, KPL, radar/optical measurement and later STRIKA 85 command and fire-control communications; Shock-wave valves, filters, dehumidifier, cooling compressor and fans for protective ventilation; Subsea grid cable and removed emergency generators; Deep-bore well, pumped wastewater and three-chamber septic treatment; Kitchen, dining room, medical room, accommodation and workshops; Steel-faced concrete-filled shock doors and multiple breakout-equipped emergency exits

5,000 m² / 53,820 ft² underground fit-out; 1,200 m of galleries and their unknown cross-sections; Three gun wells and associated shafts; Two main portals plus multiple emergency exits; Filtered ventilation, power, water and wastewater systems; Island logistics and marine access

One named battery and its island-wide emplacement system. The article also provides general coastal-artillery history, which should not be priced as additional SL1 scope.

Indeterminate

Tunnel and cavern cross-sections; Excavated volume and rock-cover depth; Concrete and reinforcement quantities; Exact emergency-exit and shaft counts; Measured gun-well geometry; Geotechnical and hydrogeological data; Current ownership, access and hazardous-material condition

No original construction cost is reported; all monetary evidence in the article concerns decommission alternatives.; The dossier headline historic cost is blank, which is defensible for construction comparison but hides useful lifecycle cost evidence unless separately classified.; The model assumes four mission packages although the source reports three gun wells.; The model treats four portal units as a class proxy; the source directly supports two main entrances and only an unspecified number of minor exits.; Water, rust, rock-safety and legacy-material hazards make photographed condition unsuitable as a clean replacement baseline.