A report released by the U.S. Department of energy on Friday concluded that the aging structures of tunnels #1 and #2 at the Hanford Nuclear Site, the now shuttered plutonium production facility that fueled the Manhattan Project, pose “extreme hazard” and “high potential hazard” for collapse.
the existing Tunnel 1 structure presents an extreme collapse hazard until such time that physical evaluation of remaining timber members and their supports can be performed. For safety purposes (e.g. avoid potential collapse, avoid exposure to high levels of radiation, etc.), placement of personnel and equipment on top of the tunnel and within the roof load zone of influence is not recommended without further evaluation
US DOE reports:
For more information about the Hanford Nuclear Site, please see KING’s video here.