They've been inside the room that had the leak, and they have video of the ruptured drum. There were no problems with the mine walls, and the evidence suggests

They've been inside the room that had the leak, and they have video of the ruptured drum. There were no problems with the mine walls, and the evidence suggests the damage was heat-related: http://www.wipp.energy.gov/wipprecovery/photo_video.html http://www.wipp.energy.gov/wipprecovery/photo_video.html