Rescue workers have found the body of a fourth miner in a flooded coal mine in south Wales, hopping that the last trapped miner could be found alive .
South Wales chief constable Peter Vaughan said that this unfortunate operation is "the one that none of us wanted" .
The officials consider that this is the Britain's worst fatal mining accident in years.
They still search the cause of the accident at the Gleision Colliery near Swansea, in south Wales, the area of coal mining, where the industry almost disappeared since Britain's labour strife of the 1980s.
The four miners were : Phillip Hill, 45, Charles Bresnan, 62, , 50, and Garry Jenkins, 39.
Three other miners got out of the mine after that accident on Thursday morning. One has been in the hospital listed as critically ill, the two others escaping largely unharmed.
Rescue teams had been working around the clock to pump the water out of the pit, to excavate the blockages and to shore up the tunnels. Divers tried to reach the men being forced to abandon their attempts.