A Massive rescue operation is underway to find five people trapped in a disused tungsten mine in the Siberian republic of Buriatia. The Republic`s President is at the site of the accident, which has already claimed seven lives. Initially, a group of men went to look for tungsten ore in the abandoned mine, ignoring warning signs. Underground, they encountered a build-up of gas, but one man managed to escape and raise the alarm. Around a dozen local former miners came to help. Once inside the mine, they were also affected by the gas. Authorities say seven people have been rescued, but three bodies remain underground.