Rescue workers are frantically trying to reach four miners trapped underground in a flooded Welsh coal mine.
As yet they have not made contact with the men, who are around 90 metres underground at the Gleision Colliery near Swansea, SkyNews reports.
The trapped men have been identified as Phillip Hill, 45, Charles Bresnan, 62, David Powell, 50, and Garry Jenkins, 39.
Authorities are unsure as to what caused the mine to flood or what condition the miners are in, but are hopeful they may be in an air pocket underground.
However, local fire services described it as “a failure of a water reservoir that was safely held underground,” News.com.au reported.
Mines Rescue Service spokesperson Mark Tibbot said they have not had any communication with the miners.
While rock has not blocked entrance to the mine, water is preventing ingresss.
However, Tibbot did say that water levels are currently receding as pumping is carried out.
Police onsite confirmed that three miners did manage to escape the mine following the incident on Thursday morning local time, although one miner was taken hospital in a critical condition.
Superintendent Phil Davies from South Wales Police told the UK’s Daily Telegraph that a "dynamic search and rescue operation" is underway.