This is a great place, I have been right to the end. Believe me it gets even more cramped. My buddy couldn't even get his cam out towards the end and it was difficult to turn round.
Might be best to go in just one at a time, the water crashing down at the end can be amazing. It does look dangerous with the water pouring down through the brickwork.
I was a member of the team who took the picture on the website posted above. We did this and "old smokey" on the same day as they are both short and both so close. Do old smokey first and then was all the soot off in the well