So I was looking back over some of the previous posts, and I realised that no-one ever tried to get through the two locked doors in that first room - the one with the three constructs in the centre.
If Ghalin and Gerbill are still with us, maybe one of them might like to go and take a look - or not, it's entirely up to you guys! Just thought I'd point out that we never found out what was through those doors...
(Or maybe Bulwark would like to go and just break them down... *grin*)