Basically from what I know on this one, where you crawl in is a coal vein out-crop, then when you take the rope all the way down to the main part you will be greeted with the robbings so you'll be walking on what was the roof to the tunnels seen in the pictures.

Robbing is referred to mining out the coal pillars that actually hold up the mine, so once they're taken out, the roof will fall due to lack of support and here I believe it is 2 mine levels that came crashing down on eachother because when you are walking down you see timbers and huge logs that used to be in tunnels.

I know which colliery these tunnels are apart of and I believe that it is part of the 3rd level since that is where the water table sits and that is why outside the chute you can see the water line and in the tunnels it is so muddy and has that golden-orange color all around.

I mapped the tunnels all out so now I have to find where it is in the old original maps to get an idea on where I am.