Piping connects the Containerized Vacuum System (CVS) at Arnold Engineering Development Complex Hypervelocity Wind Tunnel 9 to the Tunnel 9 Vacuum Sphere, Feb. 28, 2020. The primary purpose of the CVS is to reduce pressure in the Vacuum Sphere to levels at which test operations can be performed. The CVS was installed at Tunnel 9 late last year to fill in for a compressor that went down in the Tunnel 9 Vacuum Compressor Plant. (U.S. Air Force photo by Nicholas Fredrick)