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An investigation into the Gleision mining disaster has found conditions at the colliery were known.
It's claimed workers were aware underground water was present.
4 workers at the mine in the Swansea Valley were killed after a stall they were in flooded.
They'd been carrying out controlled explosions to extract coal and after the first blast on on the morning of the 15th September, the area filled with between 2,500 and 3,000 tonnes of water and silt.
The Health and Safety Executive says it swept away everything in its path, including roof supports and equipment.
Three men managed to escape, but Charles Breslin, David Powell, Philip Hill, and Garry Jenkins were trapped and sadly lost their lives.
The report shows plans of the mine that were found in manager, Malcolm Fyfield's, office.
There are several areas where underground water is clearly marked including where the men were working that day.
There was also evidence of drilling that was done to work out the thickness of the coal and to see how much water was there.
A worker who was there the day BEFORE the fatal explosion, told investigators that water was running through the bore hole like a "tap that was half turned on".
Since the deaths, new mining rules have come into force.
Mine manager Malcolm Fyfield was cleared of gross negligence manslaughter last year.