A tunnel has collapsed at a nuclear site in America used to provide weaponry for decades.
No one was hurt when the tunnel caved in at the Hanford Nuclear Reservation site, causing soil to sink about four metres across a 400 sq ft area.
Officials said there were no members of staff present in the tunnel at the time, but it still has raised the issue of worker safety at the site.
The site has been working to produce nuclear materials for weapons in the decades since World War Two.
This is not the first time safety has been raised as the site, remaining an on-going concern.
The Attorney General for Washington, Bob Ferguson, has claimed the health of employees has been adversely affected by radioactive vapour, but the Energy Department has said there is no evidence of this.