No standardized area published
Assembling intelligence…
Reading listings, research log, and source-health evidence.
BunkerStrategyIntelligence terminalBunkerStrategyIntelligence terminalReading listings, research log, and source-health evidence.
Rock fort in Vaxholm's outer defence line, begun in 1916, inspected in 1924 and first manned in 1926, with heavy concrete cover, accommodation for 270-500 people, artillery and mine-control systems.
No standardized area published
Published date and precision preserved
Completion date not established
Unit-attributed from its source article
Functional recreation of the documented facility in Sweden using current construction methods and 2026 prices, preserving the documented capacity, protection, autonomy and redundancy. Ex VAT; excluding land, financing, remediation, classified mission equipment and data-centre hardware.
Provisional audited central concept screen; expected-risk calibration is pending. It is not yet a risk-adjusted expected cost.
Method, scope and confidence →40 photographs sourced from the original article, with captions where available.
Published, calculated and proxy dimensions are deliberately separated. Missing evidence stays visible instead of becoming zero.
Rock in place removed before bulking; the excavation-pricing quantity.
Internal airspace; not the amount of rock removed.
Blasted material after bulking; the haul and disposal quantity.
These cubic metres are not interchangeable.
Usable, floor or footprint area; the label is preserved because these are not always interchangeable.
No usable quantity in the reviewed source · Evidence gapRock in place removed before bulking; the quantity used to price excavation.
Proxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype cavern-envelope factor is 6.5 design m³ per usable m². · Prior model input reviewed by auditInternal air or chamber volume. It is not solid excavation without overbreak, access and support geometry.
No usable quantity in the reviewed source · Evidence gapBlasted material after bulking, or its handled mass. No swollen cubic metres are inferred when only tonnes are modelled.
Proxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype cavern-envelope factor is 6.5 design m³ per usable m². Mass uses an assumed Swedish ha… · Reviewed mass-handling modelLength alone is insufficient; a costable tunnel also needs width, height or cross-sectional area.
No usable quantity in the reviewed source · Evidence gapPublished chamber or arch geometry used to test volume and support assumptions.
No usable quantity in the reviewed source · Evidence gapRock surface requiring bolts, mesh or shotcrete, preferably measured in square metres.
No support-area quantity is published · Audited excavation scopeCounts and dimensions of access, transfer, utility and emergency interfaces.
Archetype portal/escape count. · Reviewed base modelCast inner structures and linings, kept separate from excavated rock and reinforcement mass.
Proxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype concrete factor is 1.2 m³ per usable m². · Reviewed base modelGroundwater, inflow, drainage, pumping and moisture-control evidence affecting construction and operation.
No usable quantity in the reviewed source · Evidence gapThe headline answers the current replacement question. Historic cost, CPI and construction-index comparisons remain separate because they answer different questions.
Different specifications receive different estimates; they are not used as the upper and lower limits of one answer.
Preserves documented capacity, protection, autonomy and redundancy using current construction methods.
Requires a modern structural, fire, protection and supplier performance brief.
Requires IT load, cooling topology, grid capacity, redundancy and autonomy. Server hardware is excluded.
No representative facility construction cost selected
General purchasing-power comparison—not a construction quote
Broad BKI proxy—not a bunker-specific rebuild price
Scope lock. Functional recreation of the documented facility in Sweden using current construction methods and 2026 prices, preserving the documented capacity, protection, autonomy and redundancy. Ex VAT; excluding land, financing, remediation, classified mission equipment and data-centre hardware. Named coastal rock fort on Kyrkogårdsön, begun in 1916 and first manned in 1926. It had underground quarters and services for 270 normally and up to 500 at full readiness, a reported 4–6 m concrete roof, two 15.2 cm main guns, four 57 mm guns, searchlights an…
Audit revision sweden-replacement-audit-2026.08.15. The central WBS below incorporates the 61-article review. The former deterministic low/base/high cases remain available only as sensitivities and revision history.
Direct works + owner / design / investigation + legacy concept contingency
Central quantities × current installed-rate screen.
Not yet probability-weighted. The current legacy concept contingency remains separate.
22% applied to the direct-work screen.
Raw model SEK 698m · rounded for Confidence E.
Transitional limitation. SEK 118,702,500 is still a blanket concept contingency, not probability-weighted expected risk. This is why the amount is labelled provisional. The audited fort rock WBS remains the central scope ledger.
No subject caveat recorded.
34/100 article-geometry completeness. Detailed source extraction is available in the original-article audit.
Confidence E · geometry completeness 34/100
Largest active lines in the audited central component schedule.
The workbook publishes one revised central schedule. Its prior low and high stress cases are retained only under sensitivities; no line-level probability distributions are implied.
Hydrogeology, drainage, pumping and moisture control · SEK 15,600,000
Hydrogeology, drainage, pumping and moisture control · SEK 15,600,000
Integrated testing, commissioning and public-safe documentation · SEK 4,800,000
| Change | Scope | Audited base | Quantity / rate basis | Provenance |
|---|---|---|---|---|
| Retained | 01Fort galleries and supported excavationCivil Rock | SEK 195,000,000 | 26,000 Solid Design m³ × SEK 7,500 / Solid Design m³Class Proxy quantity · Assumption rateProxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype cavern-envelope factor is 6.5 design m³ per usable m². | Existing archive WBS |
| Retained | 02Rock mass handlingMass Handling | SEK 6,890,000 | 68,900 T × SEK 100 / TClass Proxy quantity · Derived rateProxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype cavern-envelope factor is 6.5 design m³ per usable m². Mass uses an assumed Swedish hard-rock density of 2.65 t/m³. | Existing archive WBS |
| Retained | 03Concrete roofs, galleries and emplacementsStructural | SEK 33,600,000 | 4,800 m³ × SEK 7,000 / m³Class Proxy quantity · Assumption rateProxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype concrete factor is 1.2 m³ per usable m². | Existing archive WBS |
| Retained | 04Installed reinforcementStructural | SEK 10,920,000 | 312,000 Kg × SEK 35 / KgClass Proxy quantity · Assumption rateProxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Archetype concrete factor is 1.2 m³ per usable m². Archetype reinforcement intensity is 65 kg per concrete m³. | Existing archive WBS |
| Retained | 05Support-space fit-out and utilitiesBuilding Services | SEK 48,000,000 | 3,200 m² / 34,445 ft² × SEK 15,000 / Usable m²Class Proxy quantity · Assumption rateProxy usable area for a 270-person normal and 500-person maximum garrison fort; plan dimensions are unpublished. Fit-out factor is 0.8 times the reference scale. | Existing archive WBS |
| Retained | 06Protection and resilient systemsProtection | SEK 48,000,000 | 2.67 Project × SEK 18,000,000 / ProjectAssumption quantity · Assumption rateOne protection package per 1500 usable m² / 16,146 ft², subject to a 1-package minimum. | Existing archive WBS |
| Retained | 07Entrances, exits and site interfacesSite And Access | SEK 12,000,000 | 2 Project × SEK 6,000,000 / ProjectAssumption quantity · Assumption rateArchetype portal/escape count. | Existing archive WBS |
| Retained | 09Civil emplacement packagesMission Civil | SEK 100,000,000 | 4 Emplacement × SEK 25,000,000 / EmplacementAssumption quantity · Assumption rateArchetype mission-package count. | Existing archive WBS |
| Added | R601Hydrogeology, drainage, pumping and moisture control | SEK 15,600,000 | 8% of supported-rock scope as a class-screening allowance | Class assumption — site investigation/RFQ required |
| Added | R602Integrated testing, commissioning and public-safe documentation | SEK 4,800,000 | 5% of MEP/protection/mission-system scope | Class assumption — commissioning plan required |
Active base WBS SEK 474,810,000 · owner/design and contingency are added in the scenario cards above · 12 removed rows across the archive remain visible as change history.
The three inputs most likely to move the current screen.
These deterministic stress cases simultaneously vary quantities, rates, scope allowances and contingency. They are not confidence intervals and no longer serve as the headline answer.
Links support a rate, scope boundary or method. Context-only sources are not represented as quotations.
Gryaab February-2024 long-tunnel benchmark: SEK 5,513/design m³ for excavation plus support. Low case is lightly currentized; base/high add small, constrained, non-repetitive bunker uncertainty.
Gryaab February-2024 long-tunnel benchmark: SEK 5,513/design m³ for excavation plus support. Low case is lightly currentized; base/high add small, constrained, non-repetitive bunker uncertainty.
Skanska's Ostlanken order value is SEK 240m for handling 2.0m tonnes of rock and 0.4m tonnes of soil, excluding options. The base is the observed blended benchmark; bounds are assumptions.
Public ready-mix material check only; installed underground rates require RFQ.
Public retail material check only; cutting, bending, fixing, waste and underground logistics require RFQ.
Public sources establish specialized tested products but not project prices.
Defend the outer maritime approach to Vaxholm and control a mine barrier.
Construction began.
B014Interrupted construction, inspection and first manning.
B014,B017Work stopped amid wage/economic disruption.
B014Construction resumed; proposed southern extension remained unbuilt.
B014Final inspection.
B017First manning.
B017Operational military period with accommodation curtailed by humidity and mine role continuing after gun removal.
B017,B050Original accommodation use ended after humidity problems.
B017Main guns removed.
B050Mine-control role remained active until this year.
B017Removed from wartime organization.
B050Transferred to Statens fastighetsverk.
B050Heritage restoration and public presentation.
B050Restoration began.
B050Opened to the public.
B050Heritage designation reported.
B05027 reviewed claims. Evidence locators resolve against the stored article hash or archived snapshot.
| Subject | Claim | Value | Date | Evidence | Certainty |
|---|---|---|---|---|---|
| milestone | Event | Construction began. | 1916 | B014 | Reported |
| milestone | Event | Work stopped amid wage/economic disruption. | 1918 | B014 | Reported |
| milestone | Event | Construction resumed; proposed southern extension remained unbuilt. | 1921 | B014 | Reported |
| milestone | Event | Final inspection. | 1924 | B017 | Reported |
| milestone | Event | First manning. | 1926 | B017 | Reported |
| milestone | Event | Original accommodation use ended after humidity problems. | 1939 | B017 | Reported |
| milestone | Event | Main guns removed. | 1951 | B050 | Reported |
| milestone | Event | Mine-control role remained active until this year. | 1959 | B017 | Reported |
| milestone | Event | Removed from wartime organization. | 1960s | B050 | Reported |
| milestone | Event | Transferred to Statens fastighetsverk. | 1993 | B050 | Reported |
| milestone | Event | Restoration began. | 1994 | B050 | Reported |
| milestone | Event | Opened to the public. | 1996 | B050 | Reported |
| milestone | Event | Heritage designation reported. | 2002 | B050 | Reported |
| lifecycle summary | Event | Interrupted construction, inspection and first manning. | 1916–1926 | B014,B017 | Reported |
| lifecycle summary | Event | Operational military period with accommodation curtailed by humidity and mine role continuing after gun removal. | 1926–1960s | B017,B050 | Reported |
| lifecycle summary | Event | Heritage restoration and public presentation. | 1993 onward | B050 | Reported |
| quantitative observation | Normal Garrison | 270 persons | — | B016 | Reported |
| quantitative observation | Maximum Garrison | 500 persons | — | B016 | Reported |
| quantitative observation | Concrete Roof Thickness | 4–6 | — | B019 | Reported |
| quantitative observation | Searchlight Power | 5,000 W | — | B047 | Reported |
| quantitative observation | Controlled Mines | 36 mines | — | B048 | Reported |
| quantitative observation | Optional Additional Mines | 10 mines | — | B048 | Reported |
| quantitative observation | Mine Line Length | 400 m | — | B048 | Reported |
| technical system | Habitability | Quarters, clinic, kitchen and toilets for a normal 270-person and maximum 500-person garrison. | — | B016 | Reported |
| technical system | Power | On-site generator supplied essential systems. | — | B016 | Reported |
| technical system | Weapons And Mines | Artillery, searchlight and control of a 400 m mine barrier; a proposed modern gun/torpedo expansion was not built for lack of funds. | — | B019,B047,B048 | Reported |
| protection | Mass Concrete And Rock | Principal fort spaces were under rock and a reported 4-6 m reinforced-concrete roof. | — | B019 | Reported |
Programme, sale, operating and component figures remain visible but are not silently relabelled as facility construction cost.
| Scope | Stage | Nominal | CPI 2025 | BKI 2025 | Date / evidence |
|---|---|---|---|---|---|
| Restoration/public-access project; not original construction cost. {"amountBound":null,"nonAdditive":true,"publisherLegacyEquivalentSek":null,"publisherLegacyEquivalentBasis":null} | Other | SEK 35,000,000 | SEK 58,866,703 | — | 1994 onwardB050 |