The UK Abandoned Mine Explores Youtube group uploaded a fascinating video of their camera survey down a flooded colliery pumping shaft last October.
The colliery's name is unidentified, but they managed to lower a camera 650ft down the shaft, well below the water level.
A large collapse, in what looks like shale, can be seen more than 500ft down, completely destroying much of the 1870's brick lining in that section. Then, below that, the camera uncovers a large, whitewashed chamber of unknown purpose.