57. Bed of no 2 machine.
Sole plates are in place on the machine support walls, the service tunnel is about half roofed and the abutments for the arching are being poured. Excavation of soil from the tunnel is being placed to infill the machine house floor. The ceiling is already being installed at the n0rth end from the bridge crane, the central walkway appears to be complete through the roof trusses.
