The US Department of Energy has declared an emergency at the Hanford, Washington nuclear waste storage site, after a tunnel used to store contaminated materials caved in.
A tunnel near the plutonium-uranium extraction plant (PUREX) collapsed early Tuesday morning local time, most likely from vibrations produced by nearby road work, KING-TV reported.
The tunnel was used to store highly radioactive materials and equipment, such as trains used to transport nuclear fuel rods.
https://www.rt.com/usa/387760-hanford-tunnel-collapse-nuclear/