Services Block’s ‘inlet’. One of my jobs was to do a survey of what the various rooms were being used for but some of the rooms were inaccessible, despite me having a full set of the keys from Security!
The carpentry shop is on the right and next to it was the original carpentry shop that had been used as an impromptu chair store,At the far end was the cyclone, an air filtration system for the defunct carpentry shop and to the left of that a welding shop.