Floor Area · reported
Assembling intelligence…
Reading listings, research log, and source-health evidence.
BunkerStrategyIntelligence terminalBunkerStrategyIntelligence terminalReading listings, research log, and source-health evidence.
500 m² / 5,382 ft² two-level rock HC completed in 1965 for about 60 staff and two-week isolation; lack of an emergency exit later reduced permitted occupancy to ten.
Floor Area · reported
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 →25 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.
Reported facility floor/shelter area is used as the screening usable-area basis. Archetype cavern-envelope factor is 6.7 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.
Reported facility floor/shelter area is used as the screening usable-area basis. Archetype cavern-envelope factor is 6.7 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.
Entrance Tunnel Length · Publisher articlePublished 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.
Portal/escape interfaces are based on the published access description. · 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 1.7 m³ per usable m². · Reviewed base modelGroundwater, inflow, drainage, pumping and moisture-control evidence affecting construction and operation.
Water And Waste · 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 Spättan is a 500 m² / 5,382 ft², two-level rock command centre built from 1963 to 1965. A single west-facing entrance leads down a roughly 60 m sloping tunnel to shock doors. It was built without an emergency exit. A further shock door opposite the inner e…
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 139.6m · rounded for Confidence D.
Transitional limitation. SEK 23,748,653 is still a blanket concept contingency, not probability-weighted expected risk. This is why the amount is labelled provisional. The audited command rock WBS remains the central scope ledger.
No subject caveat recorded.
70/100 article-geometry completeness. Detailed source extraction is available in the original-article audit.
Confidence D · geometry completeness 70/100
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 2,010,000
Hydrogeology, drainage, pumping and moisture control · SEK 2,010,000
Integrated testing, commissioning and public-safe documentation · SEK 2,025,000
| Change | Scope | Audited base | Quantity / rate basis | Provenance |
|---|---|---|---|---|
| Retained | 01Supported rock excavationCivil Rock | SEK 25,125,000 | 3,350 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 6.7 design m³ per usable m². | Existing archive WBS |
| Retained | 02Rock mass handlingMass Handling | SEK 843,363 | 8,878 T × SEK 95 / TDerived From Published quantity · Assumption rateReported facility floor/shelter area is used as the screening usable-area basis. Archetype cavern-envelope factor is 6.7 design m³ per usable m². Mass uses an assumed Swedish hard-rock density of 2.65 t/m³. | Existing archive WBS |
| Retained | 03Underground cast concreteStructural | SEK 5,950,000 | 850 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 1.7 m³ per usable m². | Existing archive WBS |
| Retained | 04Installed reinforcementStructural | SEK 1,041,250 | 29,750 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 1.7 m³ per usable m². Archetype reinforcement intensity is 35 kg per concrete m³. | Existing archive WBS |
| Retained | 05Interior construction and conventional MEPBuilding Services | SEK 22,500,000 | 500 m² / 5,382 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, resilience and standby systemsProtection | SEK 18,000,000 | 1 Project × SEK 18,000,000 / ProjectAssumption quantity · Assumption rateOne protection package per 900 usable m² / 9,688 ft², subject to a 1-package minimum. | Existing archive WBS |
| Retained | 07Portals, escape and utility interfacesSite And Access | SEK 6,000,000 | 1 Project × SEK 6,000,000 / ProjectDerived From Published quantity · Assumption ratePortal/escape interfaces are based on the published access description. | Existing archive WBS |
| Added | R253Hydrogeology, drainage, pumping and moisture control | SEK 2,010,000 | 8% of supported-rock scope as a class-screening allowance | Class assumption — site investigation/RFQ required |
| Added | R254Integrated testing, commissioning and public-safe documentation | SEK 2,025,000 | 5% of MEP/protection/mission-system scope | Class assumption — commissioning plan required |
| Added | R255Documented access / escape interface correction | SEK 11,500,000 | Source-specific screening allowance; replace with measured tunnel/shaft/portal take-off | Derived from original-article geometry |
Active base WBS SEK 94,994,613 · 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.
Receiving price examples range from a credit for clean blasted rock to a fee for mixed crushed rock. Actual net rate depends on haul distance, classification and beneficial reuse.
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 civil command post for maintaining law, order and municipal functions during war.
Construction began.
B006Facility completed.
B006Reportedly activated once during the U-137 submarine incident.
B009Stopped serving a civil-defence function.
B009Operations reduced to save cost; future use remained unclear in the article.
B009,B010 · B009 · B010Publisher-reported features, not a current engineering inspection or certification.
Standby generating sets and 9 m³ diesel tank; also supplied the adjacent fire station in peacetime.
B007Own freshwater well and sewerage.
B008Separate dormitories, operations room, toilets, showers and dining facilities.
B008Entrance faced west to reduce exposure to a blast from the Karlskrona target area, as explained by the publisher.
B006Long sloping tunnel and blast-door barriers; no emergency exit was built.
B006 · B00717 reviewed claims. Evidence locators resolve against the stored article hash or archived snapshot.
| Subject | Claim | Value | Date | Evidence | Certainty |
|---|---|---|---|---|---|
| milestone | Event | Construction began. | 1963 | B006 | Reported |
| milestone | Event | Facility completed. | 1965 | B006 | Reported |
| lifecycle summary | Event | Reportedly activated once during the U-137 submarine incident. | 1981 | B009 | Reported |
| lifecycle summary | Event | Stopped serving a civil-defence function. | 1999 | B009 | Reported |
| lifecycle summary | Event | Operations reduced to save cost; future use remained unclear in the article. | early 2000s | B009,B010 | Reported |
| quantitative observation | Entrance Tunnel Length | 60 m | — | B007 | Reported |
| quantitative observation | Diesel Storage | 9 m³ | — | B007 | Reported |
| quantitative observation | Isolated Endurance | 2 weeks | — | B007,B008 | Reported |
| quantitative observation | Nominal Staff | 60 persons | — | B008 | Reported |
| quantitative observation | Floor Area | 500 m² / 5,382 ft² | — | B008 | Reported |
| quantitative observation | Floors | 2 floors | — | B008 | Reported |
| quantitative observation | Later Occupancy Limit Without Emergency Exit | 10 persons | — | B009 | Reported |
| technical system | Power | Standby generating sets and 9 m³ diesel tank; also supplied the adjacent fire station in peacetime. | — | B007 | Reported |
| technical system | Water And Waste | Own freshwater well and sewerage. | — | B008 | Reported |
| technical system | Habitability And Command | Separate dormitories, operations room, toilets, showers and dining facilities. | — | B008 | Reported |
| protection | Entrance Orientation | Entrance faced west to reduce exposure to a blast from the Karlskrona target area, as explained by the publisher. | — | B006 | Reported |
| protection | Blast Doors | Long sloping tunnel and blast-door barriers; no emergency exit was built. | — | B006,B007 | Reported |