Not so much untopping as the consequences thereof.
The hillside above the Foty pit fell down in spectacular manner just over two years ago and covered the entrance to the chambers: as such, access is now impossible.
The chambers themselves do not appear to have collapsed, so presumably the arching is intact- but unreadable until someone removes about 50,000 tonnes of broken rock.
A great shame, as the Robey incline head was very well-preserved and featured some very well-constructed underground structures.
Hello again darkness, my old friend...