I think Jon asked this a few posts back, but im pondering the question again,
I guess he wasn't working in complete darkness, but he had to get out after finishing his repair to all the cracks , and it seems he filled in some joints.
The picture with Schoch, is that stone he's touching separate from the block underneath, and is that a similar triangular block behind his head,now i thought the end blocks did not support the ceiling beams, but they do look as if they are in contact with the ceiling.
Anyway, im trying to figure out where the guy got out of the chamber when he was done, that triangular block behind Schoch's head does not seem to line up with its opposite block, was that the plasterer's escape hole ?
I cant imagine them leaving a complete ceiling block open for his escape route, as how would they know that last beam didn't badly crack when they finally lowered it.
Also while im here, you can see the apex joint is open, and a couple of the white drip marks are in line with the apex opening, did something drip through from above, and do we know if there is another set of beams overlaying the first set, like the double set of the original opening of G1,