No standardized area published
Assembling intelligence…
Reading listings, research log, and source-health evidence.
BunkerStrategyIntelligence terminalBunkerStrategyIntelligence terminalReading listings, research log, and source-health evidence.
One of Bodens fästning's five rock forts, constructed 1903–1908 with a dry moat, protected self-sufficiency spaces and artillery later modernized in 1976–1979.
No standardized area published
Published date and precision preserved
Published date and precision preserved
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 →28 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 gallery/support area for a rock fort reported for roughly 500 personnel. 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 gallery/support area for a rock fort reported for roughly 500 personnel. 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. · 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 gallery/support area for a rock fort reported for roughly 500 personnel. 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. Rödbergsfortet was excavated from 1903 and completed five years later as one of five autonomous rock forts in Boden fortress. The article gives a Rödbergsfort wartime establishment of 251 artillerymen, 229 infantrymen and 20 engineers (500 people) and identif…
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 831.3m · rounded for Confidence E.
Transitional limitation. SEK 141,378,125 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 19,500,000
Hydrogeology, drainage, pumping and moisture control · SEK 19,500,000
Integrated testing, commissioning and public-safe documentation · SEK 6,000,000
| Change | Scope | Audited base | Quantity / rate basis | Provenance |
|---|---|---|---|---|
| Retained | 01Fort galleries and supported excavationCivil Rock | SEK 243,750,000 | 32,500 Solid Design m³ × SEK 7,500 / Solid Design m³Class Proxy quantity · Assumption rateProxy gallery/support area for a rock fort reported for roughly 500 personnel. Archetype cavern-envelope factor is 6.5 design m³ per usable m². | Existing archive WBS |
| Retained | 02Rock mass handlingMass Handling | SEK 8,612,500 | 86,125 T × SEK 100 / TClass Proxy quantity · Derived rateProxy gallery/support area for a rock fort reported for roughly 500 personnel. 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 42,000,000 | 6,000 m³ × SEK 7,000 / m³Class Proxy quantity · Assumption rateProxy gallery/support area for a rock fort reported for roughly 500 personnel. Archetype concrete factor is 1.2 m³ per usable m². | Existing archive WBS |
| Retained | 04Installed reinforcementStructural | SEK 13,650,000 | 390,000 Kg × SEK 35 / KgClass Proxy quantity · Assumption rateProxy gallery/support area for a rock fort reported for roughly 500 personnel. 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 60,000,000 | 4,000 m² / 43,056 ft² × SEK 15,000 / Usable m²Class Proxy quantity · Assumption rateProxy gallery/support area for a rock fort reported for roughly 500 personnel. Fit-out factor is 0.8 times the reference scale. | Existing archive WBS |
| Retained | 06Protection and resilient systemsProtection | SEK 60,000,000 | 3.33 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 | R591Hydrogeology, drainage, pumping and moisture control | SEK 19,500,000 | 8% of supported-rock scope as a class-screening allowance | Class assumption — site investigation/RFQ required |
| Added | R592Integrated testing, commissioning and public-safe documentation | SEK 6,000,000 | 5% of MEP/protection/mission-system scope | Class assumption — commissioning plan required |
Active base WBS SEK 565,512,500 · 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.
Artillery defence as part of Bodens fortress belt.
Construction began.
B005Fort completed as one of five rock forts.
B005Long military service with major 1970s modernization.
B005,B010,B066Associated satellite battery built.
B011Main artillery modernized, increasing stated range from 7 km to 19 km.
B010Last ceremonial salute reported.
B015Removed from wartime organization according to a later passage.
B066Article also describes the fort as active until around this year.
B018Preserved for heritage and museum presentation.
B01817 reviewed claims. Evidence locators resolve against the stored article hash or archived snapshot.
| Subject | Claim | Value | Date | Evidence | Certainty |
|---|---|---|---|---|---|
| milestone | Event | Construction began. | 1903 | B005 | Reported |
| milestone | Event | Fort completed as one of five rock forts. | 1908 | B005 | Reported |
| milestone | Event | Associated satellite battery built. | 1970 | B011 | Reported |
| milestone | Event | Main artillery modernized, increasing stated range from 7 km to 19 km. | 1976–1979 | B010 | Reported |
| milestone | Event | Last ceremonial salute reported. | 1997 | B015 | Reported |
| milestone | Event | Removed from wartime organization according to a later passage. | 1998 | B066 | Reported |
| milestone | Event | Article also describes the fort as active until around this year. | 2000 | B018 | Reported |
| lifecycle summary | Event | Long military service with major 1970s modernization. | 1908-late 1990s | B005,B010,B066 | Reported |
| lifecycle summary | Event | Preserved for heritage and museum presentation. | post-service | B018 | Reported |
| quantitative observation | Forts In Boden Rock Fort Group | 5 forts | — | B005 | Reported |
| quantitative observation | Post Modernization Artillery Range | 19 km | — | B010 | Reported |
| quantitative observation | Satellite Battery Guns | 2 12 cm guns | — | B011 | Reported |
| quantitative observation | Reported Total Staff | 500 persons | — | B067,B068,B069,B070 | Inferred |
| technical system | Artillery | Original gun suite was later modernized; associated satellite battery carried two 12 cm guns. | — | B007,B008,B009,B010,B011 | Reported |
| technical system | Autonomy | Protected spaces supported accommodation, command and essential services for isolated operation. | — | B025 | Reported |
| protection | Rock Cover | Fort was blasted into rock as one of the fortress's five primary forts. | — | B005 | Reported |
| protection | Dry Moat | A dry moat and close-defence arrangement protected the perimeter. | — | B005 | Reported |