The Götiska battery is a single rock-cut flank/blocking battery within Oscar II fort, begun in the 1902 fort-building context and operational until 1986. Its layout comprises a main gated room, two rock-tunnel branches, four 5.7 cm gun positions with concrete foundations and iron shielding, ammunition storage, troop/officer quarters, kitchen, generator room and a long western searchlight gallery with rail and turntable. No area, tunnel length, section or excavation volume is stated.

portals: value: 2 | scope: single battery | note: One main entrance with two successive pairs of heavy iron gates and one former water-facing searchlight portal, later bricked up. | inner_structure: Rock-cut rooms and galleries with masonry partitions, poured concrete gun foundations, a narrow concrete walkway and heavy iron defensive elements; a troop room was later internally rebuilt for chemical-agent protection. | other: Four 5.7 cm gun positions are explicit, arranged as two pairs along the eastern gallery.; Two rock tunnels leave the first large room: an eastern gun/accommodation branch and a long western searchlight branch.; Floor channels follow the rock wall to drain water; the searchlight room contains railway track and a turntable.; The article says a proposed protected link to the rest of Oscar II fort was never built.

system: power | evidence: A large engine originally generated electricity; after 1939 the wider fort reportedly received a dedicated grid feed from Trollhättan. | scope: battery/fort context; system: CBRN protection | evidence: One troop-accommodation room was later rebuilt internally as a space protected against chemical agents; its construction is now deteriorated. | scope: single battery; system: water and drainage | evidence: Two toilets and carefully cast floor drainage channels are described; no supply, sewage or pump capacity is given. | scope: single battery; system: communications | evidence: A speaking tube connected the officer room and searchlight room; no modern telecom system is quantified. | scope: single battery; system: mission equipment | evidence: Four 5.7 cm guns on cast foundations, ammunition room, later fire-control post, mobile searchlight on rail and turntable, and defensive pistol ports. | scope: single battery

branching rock-gallery excavation and support; four gun emplacements and iron shielding; main and searchlight portals with heavy gates; ammunition and accommodation fit-out; drainage in a wet marine-rock environment; searchlight rail/turntable civil works; heritage-quality restoration of masonry, concrete and ironwork

One named battery inside the larger Oscar II fort. The battery's four guns and galleries are unit evidence; references to fort-wide power and the unbuilt link must not expand the modeled physical subject to all of Oscar II fort.

Held after source-specific review.

measured gallery lengths and sections; usable and gross floor area; excavated-rock volume and support class; gun-emplacement and iron-shield geometry; portal and door dimensions; drainage flows and rehabilitation scope; construction cost and completion date

The article is based partly on a private guided visit and visual interpretation; apparent size is not a measurement.; The proposed tunnel connection to Oscar II fort was never built and must not be costed.; Fort-wide power history is context, not necessarily a battery-specific replacement package.; The dossier's area and excavation quantities are pure archetype proxies.