Floor Area · reported
Assembling intelligence…
Reading listings, research log, and source-health evidence.
BunkerStrategyIntelligence terminalBunkerStrategyIntelligence terminalReading listings, research log, and source-health evidence.
700 m² / 7,535 ft² two-level protected command site in an esker, combining HC Ernst with LGC Karpen and a defence-area group staff function.
Floor Area · reported
Start date not established
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 →22 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.
Floor Area · reported · Publisher articleRock in place removed before bulking; the quantity used to price excavation.
12% of structural scope as a buried-class screen · Audit revisionInternal 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.
No rock mass-handling scope applies to the audited morphology. · Audited morphologyLength 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.
Rock-support surface does not apply to this audited morphology. · Audited morphologyCounts and dimensions of access, transfer, utility and emergency interfaces.
A steel-door guarded entrance is described; additional emergency access is unknown. · Reviewed base modelCast inner structures and linings, kept separate from excavated rock and reinforcement mass.
Reported facility floor/shelter area is used as the screening usable-area basis. Archetype concrete factor is 1.8 m³ per usable m². · Reviewed base modelGroundwater, inflow, drainage, pumping and moisture-control evidence affecting construction and operation.
Water · Publisher articleThe 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. HC Ernst is an underground two-level, 700 m² / 7,535 ft² civil-defence command centre located in a glacial esker. One guarded descent/entry is concealed by two steel doors; a small guard room has a firing slit. It contains an operations room, male/female dorm…
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 99.6m · rounded for Confidence E.
Transitional limitation. SEK 16,938,675 is still a blanket concept contingency, not probability-weighted expected risk. This is why the amount is labelled provisional. The audited command uncertain WBS remains the central scope ledger.
Located underground in an esker, but structural material is not published.
45/100 article-geometry completeness. Detailed source extraction is available in the original-article audit.
Confidence E · geometry completeness 45/100
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.
Excavation, temporary works, waterproofing and backfill · SEK 1,058,400
Drainage, sumps and moisture control · SEK 352,800
Integrated testing, commissioning and public-safe documentation · SEK 2,275,000
| Change | Scope | Audited base | Quantity / rate basis | Provenance |
|---|---|---|---|---|
| Removed | 01Conditional rock excavation and supportCivil Rock | SEK 15,750,000Excluded from revision | 2,100 Solid Design m³ × SEK 7,500 / Solid Design m³Derived From Published quantity · Assumption rateReported facility floor/shelter area is used as the screening usable-area basis. Archetype cavern-envelope factor is 3 design m³ per usable m². | Existing archive WBS |
| Removed | 02Conditional rock mass handlingMass Handling | SEK 556,500Excluded from revision | 5,565 T × SEK 100 / TDerived From Published quantity · Derived rateReported facility floor/shelter area is used as the screening usable-area basis. Archetype cavern-envelope factor is 3 design m³ per usable m². Mass uses an assumed Swedish hard-rock density of 2.65 t/m³. | Existing archive WBS |
| Retained | 03Reinforced-concrete protected structureStructural | SEK 8,820,000 | 1,260 m³ × SEK 7,000 / m³Derived From Published quantity · Assumption rateReported facility floor/shelter area is used as the screening usable-area basis. Archetype concrete factor is 1.8 m³ per usable m². | Existing archive WBS |
| Retained | 04Installed reinforcementStructural | SEK 3,748,500 | 107,100 Kg × SEK 35 / KgDerived From Published quantity · Assumption rateReported facility floor/shelter area is used as the screening usable-area basis. Archetype concrete factor is 1.8 m³ per usable m². Archetype reinforcement intensity is 85 kg per concrete m³. | Existing archive WBS |
| Retained | 05Interior construction and conventional MEPBuilding Services | SEK 31,500,000 | 700 m² / 7,535 ft² × SEK 45,000 / Usable m²Derived From Published quantity · Assumption rateReported facility floor/shelter area is used as the screening usable-area basis. Fit-out factor is 1 times the reference scale. | Existing archive WBS |
| Retained | 06Protection and resilient systemsProtection | SEK 14,000,000 | 0.78 Project × SEK 18,000,000 / ProjectAssumption quantity · Assumption rateOne protection package per 900 usable m² / 9,688 ft², subject to a 0.5-package minimum. | Existing archive WBS |
| Retained | 07Access, escape and utilitiesSite And Access | SEK 6,000,000 | 1 Project × SEK 6,000,000 / ProjectClass Proxy quantity · Assumption rateA steel-door guarded entrance is described; additional emergency access is unknown. | Existing archive WBS |
| Added | R226Excavation, temporary works, waterproofing and backfill | SEK 1,058,400 | 12% of structural scope as a buried-class screen | Class assumption — earthworks take-off required |
| Added | R227Drainage, sumps and moisture control | SEK 352,800 | 4% of structural scope as a buried-class screen | Class assumption — site investigation/RFQ required |
| Added | R228Integrated testing, commissioning and public-safe documentation | SEK 2,275,000 | 5% of MEP/protection/mission-system scope | Class assumption — commissioning plan required |
Active base WBS SEK 67,754,700 · 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.
Ordinary critical-facility sanity check, not protected-bunker equivalence.
Public sources establish specialized tested products but not project prices.
Protected municipal command post, also housing LGC Karpen and a defence-area group staff.
Civil function moved to a new RC facility at the city's fire station.
B006Civil-defence role judged obsolete and decommissioning began.
B006Facility was neither stripped nor sealed for reasons the publisher could not explain.
B006Publisher-reported features, not a current engineering inspection or certification.
Operations room, sex-separated accommodation, kitchen/dining, toilets and showers.
B005Own freshwater well.
B005Standby power; rating and endurance not stated.
B005LGC Karpen tactical map room linked to surrounding observation towers.
B007Steel-door entrance and guard room with firing slit.
B00310 reviewed claims. Evidence locators resolve against the stored article hash or archived snapshot.
| Subject | Claim | Value | Date | Evidence | Certainty |
|---|---|---|---|---|---|
| milestone | Event | Civil-defence role judged obsolete and decommissioning began. | 1995 | B006 | Reported |
| milestone | Event | Civil function moved to a new RC facility at the city's fire station. | mid-1990s | B006 | Reported |
| lifecycle summary | Event | Facility was neither stripped nor sealed for reasons the publisher could not explain. | after 1995 | B006 | Reported |
| quantitative observation | Floor Area | 700 m² / 7,535 ft² | — | B005 | Reported |
| quantitative observation | Floors | 2 floors | — | B005 | Reported |
| technical system | Habitability And Command | Operations room, sex-separated accommodation, kitchen/dining, toilets and showers. | — | B005 | Reported |
| technical system | Water | Own freshwater well. | — | B005 | Reported |
| technical system | Power | Standby power; rating and endurance not stated. | — | B005 | Reported |
| technical system | Air Surveillance | LGC Karpen tactical map room linked to surrounding observation towers. | — | B007 | Reported |
| protection | Guarded Entrance | Steel-door entrance and guard room with firing slit. | — | B003 | Reported |