No standardized area published
Assembling intelligence…
Reading listings, research log, and source-health evidence.
BunkerStrategyIntelligence terminalBunkerStrategyIntelligence terminalReading listings, research log, and source-health evidence.
The archive documents Träbjörn / Björn 1 as a surface air group command post. Completion is recorded in 1959. Its documented role was central wartime command of E 1 attack and transport air operations.
No standardized area published
Start date not established
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 →17 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.
The audited morphology is not a rock-excavation class. · Audited morphologyInternal 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 tunnel geometry applies to the audited morphology. · Audited morphologyPublished 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.
No usable quantity in the reviewed source · Evidence gapCast inner structures and linings, kept separate from excavated rock and reinforcement mass.
No usable quantity in the reviewed source · Evidence gapGroundwater, 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. The titular Träbjörn/Björn 1 was an above-ground command centre assembled from wooden barracks, with a two-storey central command building, about 25 rooms, an order hall, large operations room and an extension containing pantry, day room and sleeping cabins.…
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 96.3m · rounded for Confidence E.
Transitional limitation. SEK 16,375,000 is still a blanket concept contingency, not probability-weighted expected risk. This is why the amount is labelled provisional. The audited command surface WBS remains the central scope ledger.
A concealed timber command facility, explicitly not structurally hardened.
15/100 article-geometry completeness. Detailed source extraction is available in the original-article audit.
Confidence E · geometry completeness 15/100
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.
No explicit active base-WBS line.
No explicit active base-WBS line.
Integrated testing, commissioning and public-safe documentation · SEK 750,000
| Change | Scope | Audited base | Quantity / rate basis | Provenance |
|---|---|---|---|---|
| Retained | 05Secure command buildingBuilding | SEK 24,750,000 | 750 m² / 8,073 ft² × SEK 33,000 / Usable m²Derived From Published quantity · Assumption rateGFA range derived from 25 reported rooms over two floors using 20/30/44 m² / 215 / 323 / 474 ft² gross-per-room scenarios. | Existing archive WBS |
| Retained | 09Command, communications and secure ICTMission Systems | SEK 15,000,000 | 1 Reference Package × SEK 15,000,000 / Reference PackageAssumption quantity · Assumption rateOne mission package per 900 usable m² / 9,688 ft², subject to a 1-package minimum. | Existing archive WBS |
| Retained | 12External utilities and site integrationSite And Access | SEK 25,000,000 | 1 Site × SEK 25,000,000 / SiteAssumption quantity · Assumption rateThe estimate subject covers 1 facility. | Existing archive WBS |
| Added | R618Integrated testing, commissioning and public-safe documentation | SEK 750,000 | 5% of MEP/protection/mission-system scope | Class assumption — commissioning plan required |
Active base WBS SEK 65,500,000 · 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.
Public material establishes specialized systems but no prices. Package values are assumptions and must not be read as classified equivalence.
Central wartime command of E 1 attack and transport air operations.
Träbjörn stood provisionally ready two weeks before the year's air-group exercise.
B019Träbjörn primary-command phase, subject to contested retrospective accounts.
B008,B011,B012,B019CE 1 proposed reusing barracks from wartime airfield 7 for a central wartime command post.
B019Twelve-channel radio-relay connection completed.
B025Wennerström disclosure compromised the site; Träbjörn ceased as primary command post and became exercise/reserve site.
B008,B028,B029CE 1 ordered Träbjörn modernized to better match Stenbjörn methods and equipment.
B03115 reviewed claims. Evidence locators resolve against the stored article hash or archived snapshot.
| Subject | Claim | Value | Date | Evidence | Certainty |
|---|---|---|---|---|---|
| milestone | Event | CE 1 proposed reusing barracks from wartime airfield 7 for a central wartime command post. | early 1959 | B019 | Reported |
| milestone | Event | Träbjörn stood provisionally ready two weeks before the year's air-group exercise. | 1959 | B019 | Reported |
| milestone | Event | Twelve-channel radio-relay connection completed. | summer 1962 | B025 | Reported |
| milestone | Event | Wennerström disclosure compromised the site; Träbjörn ceased as primary command post and became exercise/reserve site. | 1963 | B008,B028,B029 | Reported |
| milestone | Event | CE 1 ordered Träbjörn modernized to better match Stenbjörn methods and equipment. | 1968-01 | B031 | Reported |
| lifecycle summary | Event | Träbjörn primary-command phase, subject to contested retrospective accounts. | 1959–1963 | B008,B011,B012,B019 | Reported |
| quantitative observation | Trabjorn Floors | 2 floors | — | B006 | Reported |
| quantitative observation | Main Building Rooms | 25 rooms | — | B020 | Reported |
| quantitative observation | Direct Communications Links | 50 links | — | B025 | Reported |
| quantitative observation | Radio Relay Channels | 12 channels | 1962 | B025 | Reported |
| quantitative observation | Minimum Distance From Area Airbases | 10 km | — | B018 | Reported |
| technical system | Command | Two-storey operations centre with central 'church' room, weather, cryptography and teleprinter positions. | — | B006 | Reported |
| technical system | Communications | Direct links to attack bases, 50 direct circuits and a 12-channel radio-relay link. | — | B007,B025 | Reported |
| technical system | Habitability | Main building had roughly 25 rooms, orders room, operations room, kitchenette, day room and sleeping cabins. | — | B020 | Reported |
| protection | Concealment Only At Trabjorn | Timber barracks in dispersed woodland offered concealment but explicitly lacked better structural protection. | — | B003,B007,B010 | Reported |