Facility Schematic: Containment Chamber 4-C

SUB-89-CELL · Capitol Hill Site, Sub-level 4 · 1983-1987 · released in part

Chamber 4-C was built in 1983 and decommissioned in 1987. Interior surfaces were poured in a single continuous pass: no seams, no fixtures, no right angles at floor level. This was the Institute's first guess, and it was wrong.

Doors carry their own resonant frequency. That was never the problem. The problem was ███████████████████.

The walls were held at a continuous ██████████ for four years, tuned to cancel the frequency rather than contain it.

Staff were rotated out at six weeks. Longer postings produced █████████████████████, and what the medical files call ████████████████████████████.

Status: ██████████████.

Released in part under the Pacific Northwest Acoustic Preservation Act. Withheld text is withheld for your safety. If you hold a release code for this record, enter it in the interactive archive. All records.