This statement may explain why customers in the pub experienced the ceiling coming down in a number of stages...
Mr Goodhew said: "Part of the reason it has been so difficult for emergency services to undertake the rescue is that this particular premises used to be a tenemented building.
"It was three or four storeys high, so actually the walls you see are not nine inches thick, they are almost a metre thick at the bottom.
"Therefore the walls are substantial and they are made of sandstone and where you see a roof, that's actually the third roof covering."
BBC News - Glasgow helicopter crash: Clutha bar building 'hampered recovery work'