The second oil drum was fitted after after I was trapped in there and could not get to the first drum we had fitted.
I cut a section out of a second drum, to fit inside the first one but when we arrived on site the second drumm was the same size as first! The only way to make it function was not to fasten up the second drum.
Hence it was inherently weak. The falls beyond this one are not as bad! (at least we tried to make them so).
Ventilation was a problem, although with Minco's drilling they might have changed this.
There is no way to bypass this oildrums, which is directly under the burn, hence the water!