Hi Morganllan, ok I'll tell you what I know, the munitions factory was spread all over where the Wrexham indiustrial estate is now and as a kid we used to go down there playing, if my memory serves me right behind the Saab garage which is across the road from the old BICC factory ( where I served my time as an apprentice, a story to follow ), there was a series of underground tunnels which interlinked the various buildings which are all constructed to a blast proof specification, as kids we had no idea what they where but when I was doing my apprenticeship one of the jobs I had to do with the bloke I was serving my time with was to convert one of these buildings which BICC owned into a test laboratory for testing new pvc materials. The building was flooded as the MOD had filled in the gaps between the banks which surrounded them ( the banks where to stop any blast if it should occur ) and over the years the rain water flooded it, anyway when they drained it it was full of Perch and Tench so they threw them into their own fishing pond to stock them. One memory I have whilst working on this building was we had to fit a load of electrical gear to the walls but because they were so tough the masonary drills just broke and blunted themselves so the foreman decided to use a Hilti nail gun ( the Hilti nail gun if your not familiar with is a nail gun which uses small explosive cartridges to fire the nails in to the walls ) I think you know what's coming, when we fired it the nail ricoched off the wall and it was just like a bullet firing around the room, we eventually got them to stay in by firing them into the mortar but it was hard going, happy days eh.