This contains recovered materials associated with Project Echo, a classified research programme tasked with analysing an anomalous transmission detected on an unassigned frequency.

The material presented here is incomplete. Some files are damaged. Others were never meant to be preserved.

Early assessments described the transmission as noise. Later assessments withdrew that conclusion.

Project Echo was terminated before a stable explanation was reached. Portions of the archive were sealed. Others were erased.

The recordings and documents published here are provided without interpretation. No conclusions are offered — only recovered material and the gaps between them.

Certain recordings have been reported to produce inconsistent perceptual effects. Responses vary.

If you are experiencing changes in sleep, memory, or a sense of recognition not attributable to prior exposure, Project Echo recommended discontinuation.

That recommendation was not followed.