Hi,
Which dam are you referring to ?
During the rediscovery of deep adit level in 1971, there was a dam below a shaft, because of muck having fallen down from above, but we cleared this to get access further through to Ley's shaft. That opened up a superb through trip......
At the time the adit entrance was a long duck, and the train entrance was blasted much later on !
Ley's shaft was 500feet deep to adit, most on a steep underlie.
Before the adit was found, we made self-lifelining devices to get back up all the electon ladders....
Pity the place has closed, though.
Best Wishes,
D Send.