(Follow live updates from the scene below.)
Seven miners were working in a a colliery in the Swansea Valley in south Wales Friday when a blasting work accident caused water to flow into the tunnels.
While three men escaped the mine, the four remaining miners all died in the flooded shafts 300 feet below the ground, the Guardian reports.
Watch video of the rescue efforts in the mine below:
Follow live updates from journalists on the ground, via a Twitter list from Storyful, below: