Wednesday, October 7, 2026
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There Is A Railway Station Under Denver Airport

Nineteen sheets of 1992 drawings show six floors under Concourse D. The record says three. Sheet 11 has platform edges, tactile strips and two tunnel bores — and we have never been below level three.

A months-long reporting project. Documents cited below are held in The Vault and available to readers.

Sheet 4 of 19. Note 13 is at lower right. Engraved from the original by They Buried

She rang us because our number was in his address book. We have still never been below level three of that building, and everything in this story rests on paper and on one woman's memory.

Figure What is under Concourse D, by the 1992 drawings
Concourse D, departures0Baggage handlingIn the public record. Open totours.−8mPlant and chillersIn the public record. Open totours.−16mTrain tunnel, automated people moverIn the public record. You haveridden it.−24mLevel −4 · function not statedDimensioned. Slab thickness 900mm— three times the level above.−39mIN NO PUBLISHED RECORDLevel −5 · function not statedDimensioned. Ventilation sized for1,400 people.−55mIN NO PUBLISHED RECORDLevel −6 · four platforms, 340m islandSheet 11: platform edges, tactilestrips, two 7.6m tunnel bores−71mIN NO PUBLISHED RECORD
Depths are from the drawings' own dimensions. The airport says the building has three subterranean levels and that the lower three were never built. They Buried, from PX-1402 sheets 4 and 11

What the drawings show

Six floors. The published record describes three.

Levels four, five and six are drawn to full detail. Slab thicknesses. Duct sizing. Penetration schedules. Level six carries four platform edges, tactile warning strips, and a 340-metre island platform with two 7.6-metre tunnel bores leaving the sheet to the north-east.

That is a railway station. It is drawn like one because that is what a railway station looks like on a mechanical drawing.

Three notes sit at the lower right of sheet 4, in the same hand as everything else:

Document PX-1402, sheet 4 of 19 — general notes

NOTE 11: LEVELS -4, -5 AND -6 NOT IN THIS CONTRACT.

NOTE 12: COORDINATE PENETRATIONS WITH OTHER CONTRACTOR.

NOTE 13: DO NOT FIELD-VERIFY BELOW LEVEL -3.

What the engineer said

We paid Priya Venkataraman-Cole $2,400 to read the sheets. We told her before she started that we would print her report whatever it said. The fee and the report are both in PX-1402.

Her four findings, short:

  • The set is genuine. Title block, revision clouds and sheet numbering are all correct for a 1992 package.
  • The lower three levels are drawn in too much detail to be space a designer merely reserved. You do not size ductwork for a room you are not building.
  • Note 11 is ordinary. It means the mechanical subcontractor was not pricing those floors. It does not tell you whether they exist.
  • Note 13 is not ordinary. "Do not field-verify" tells a crew not to go and measure. She has seen it four times in twenty-two years. Every time, access was controlled by somebody else.

The woman who says she was down there

Beverly Nakashima-Ruel welded handrail on the 1993 fit-out. She is 71, lives in Pueblo, and had never spoken to a reporter before June.

She says she went below level three eleven times, on a manlift, in a cage, with a badge she handed back at the end of each shift. She says the last floor was long and flat and had a trench down the middle. She says nobody told her what it was and she did not ask, because it was 1993 and the job paid.

"There was a curve on it," she said. "You could see the far end bending away. Whatever it was, it was going somewhere."

We have not been able to corroborate any of that. Her badge is gone. The staffing agency dissolved in 1998. Her account is printed because she gave it on the record, under her own name, and because leaving it out would be a decision we could not defend.

What the airport says

Three levels. The lower three were descoped in 1993 and never built.

The full answer runs below, unedited, with nothing from us underneath it. It makes a fair point that we should have made earlier: bid drawings show unbuilt space all the time, the as-built record is public, and nobody has ever stopped anyone reading it.

It also offers our reporter a place on the next public tour, which we have accepted. That tour is on 12 September and goes to level three.

We have asked to go to level four. We have not had an answer to that.

Corrections to this story

  1. editors-note — Readers have asked why this story does not say what is on levels four, five and six. It does not say because we do not know, and we have added a line to that effect at the top of the piece. The drawings show that the levels are dimensioned. They do not show what is in them, and we have no source who has been in them.
    How it happened: Not an error, but the story's silence on the obvious question was itself misleading by omission.
    What we changed: An editor's note added at the head of the story.

Sources & Method

A woman clearing her father's garage rang us. We drove out, photographed six sheets, and did three things before writing a word. We paid an engineer to read them and told her we would print her report either way. We found a second man from the same job and asked him what the notes meant without telling him why. And we put the discrepancy to the airport in writing and waited three weeks. Their answer is below, in full, with nothing from us underneath it.

Who we spoke to

  1. Dolores Wisniewski-Trant, Daughter of Emil Wisniewski, sheet-metal foreman. Interviewed at her home in Aurora; gave us the drawings and the box 19 September 2025 and 4 March 2026 Named with written consent. Took no payment and was offered none.
  2. Marvin Okonjo-Steele, Retired mechanical estimator on the 1992 package. Telephone, three times Oct 2025 – Jan 2026
  3. Beverly Nakashima-Ruel, Retired ironworker; welded handrail on the 1993 fit-out. Interviewed in person in Pueblo 2 June 2026 The only person we have found who says they worked below level three. Her account is printed in full and is uncorroborated.
  4. Priya Venkataraman-Cole, Structural engineer, hired by this newspaper. Written report; fee $2,400, published 11 February 2026
  5. Denver International Airport, Office of the chief executive. Written questions 2 April 2026; answer 24 April April 2026 Printed in full under Right of Reply.

Documents

  • PX-1402 — Denver International Airport, Concourse D substructure — mechanical drawings, sheets 1–6 of 19 accepted

What we could not confirm

  • That anything was built below level three. We have drawings and one witness. We have not been down there.
  • Where the two tunnel bores go. They leave the sheet heading north-east and the next sheet is one of the thirteen we do not have.
  • Who the 'other contractor' in Note 12 was. Nobody will say and the 1992 bid records are not in the archive we were given.

How Others Covered This

The same events, as reported elsewhere on the same day. We list what each outlet had that we did not, as well as what we had that they did not — including where we come off worse. Why we print this.

  1. The Verity Beacon
    Airport Offers Public Tour After Drawings Query

    Led on the airport's answer, not the drawings.

    Had that we did not

    Tour attendance figures back to 2011, from the airport's own visitor system.

    Left out

    Sheet 11. Their piece does not mention the platforms.

  2. The Meridian Telegraph
    WHAT'S UNDER DENVER AIRPORT? SIX SECRET FLOORS, LEAKED PLANS REVEAL

    Called the drawings leaked. They were found in a garage and handed to us, and we said so.

    Had that we did not

    Nothing.

    Left out

    That these are bid drawings; that bid drawings often show unbuilt space; and the airport's answer, which ran as half a sentence at the end.

  3. They Buriedthis newspaper
    There Is A Railway Station Under Denver Airport

    Printed the drawings, paid an engineer to read them, and put the airport's denial at equal length.

    Had that we did not

    Sheet 11, the engineer's report and her fee, and the foreman who welded down there.

    Left out

    For two weeks this story did not say we have never been below level three. It says so now, in the second paragraph. — V. Ashcombe-Doyle, standards editor

Right of Reply

They Buried contacted Denver International Airport on 2 April 2026 at 15:40 UTC, in writing, with the sheets attached and 21 days to reply. The airport replied on 24 April and asked that its statement run in full. It does.

Denver International Airport has three subterranean levels beneath Concourse D. That has been true since we opened in 1995. It is in the as-built record, in every fire filing since, and in the annual inspections, all of which are public and none of which we have ever restricted.

What you have is a bid-stage mechanical set from 1992, three years before opening. Bid drawings routinely dimension space that is never built. Scope gets cut. It got cut here. The notes you highlight — 'not in this contract', 'coordinate with other contractor', 'do not field-verify below level −3' — appear on thousands of drawing sets and mean what they say.

We understand why this is interesting. We would ask you to print, as prominently, that we run fourteen public tours of the subterranean levels a year, that anyone may book one, and that we have offered your reporter a place on the next.

The offer stands. Bring a camera.

Published unedited under our right-of-reply guarantee.

How was this story?

We publish the result, whatever it is. Reader verdicts appear on the front page and in our newsroom metrics.

265 verdicts · 99.2% loved it

Readers' Letters 2

Printed at once under the name you give and read by the desk afterwards; anything unfit is removed, with a note saying so, and nothing else is ever deleted — only corrected. Letters that changed something in the story carry a mark saying so, and there are 5 of those across the archive.

  1. Dolores Wisniewski-TrantAurora, Colorado

    My father would have hated being in a newspaper and he would have read this four times. He kept everything because he thought somebody would need it one day. I did not believe him.

  2. T. OkaforDenver

    I have been on that tour. It is mechanical rooms. It is a LOT of mechanical rooms. Go on the tour.

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