Earth Observatory Array Elements – Treak Cliff (EOAE-TC) was initiated as core particle and cosmic ray observatory structure in the show caves of Treak Cliff Cavern. It is part of a global set of observatories, operated by the Shift Register on a shoestring budget for an undisclosed period, within key sites of industrial, infrastructural and scientific interest. Of late, EOAE-TC’s key researchers appear to have hurriedly abandoned this particular facility for reason which remain obscure, although three apparently operative observatory structures remain within the cave structure. Their purpose only inferred by weak audio signals which these devices continue to emit. With thanks to Jamie Allen and all at the AND festival 2017.