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Roswell · The Signal Desk

A signal, a headline, a correction

Roswell contains two kinds of signal: the public messages about the recovery, and the secret listening experiment later offered to explain it.

4 min read · July 1947 · reviewed 28 October 2026

Dated communications

From headline to audit

1947 messages1994–95 investigations

  1. Contemporary communication

    Dallas reports a balloon-and-reflector resemblance, but also records that a telephone conversation with Wright Field had not confirmed that belief. The same message can contain a proposed identification and unresolved checking.

    Open original →
Concept illustration: a string of high-altitude balloons carrying instruments above the desert at night, with symbolic cyan sound-wave arcs.
Concept illustration of a balloon-borne acoustic experiment; not the equipment layout or trajectory of a particular flight. Cyan arcs are symbolic sound waves.

Project MOGUL

The real secret: listening for nuclear tests

  1. Listen

    A microphone system was intended to detect low-frequency pressure waves from distant explosions in an atmospheric sound channel.

  2. Stay aloft

    Balloon development sought to hold instruments at useful altitudes long enough to gather information.

  3. Track and relay

    Tracking and telemetry connected airborne instruments with receivers. Radar reflectors helped locate balloons; they were not themselves microphones.

Flight 4: the disputed link

Where the Flight 4 argument bites

The existence of MOGUL is not the same question as identifying one particular balloon flight with Brazel's debris. Researcher Kevin Randle challenges the proposed Flight 4's timing and configuration, pointing to the flight-table gap and Crary's June 4 diary wording. The diary mentions cancelled balloon flights and a sonobuoy flown on a balloon cluster. The dispute is how to interpret that entry and reconstruct the hardware — not whether a secret balloon programme existed.

Official technical research synopsis

Synopsis of Balloon Research Findings: Project MOGUL

James McAndrew, U.S. Air Force; transcript hosted by Richard Muller, LBNL

Read the official synopsis: Synopsis of Balloon Research Findings: Project MOGUL (opens in a new tab)

Named investigator's critique

Mogul Flight No. 4 — The End

Kevin Randle, A Different Perspective

Read the critique: Mogul Flight No. 4 — The End (opens in a new tab)

Read the message, not just the headline

The FBI teletype is especially useful because it preserves uncertainty inside a contemporary communication. Open its original scan in The Archives, alongside the later audit.