9 b) You are looking UP above the Main Blast doors, the exhaust ventilation trunking exits through the wall into the corridor you have just walked through (and vents out via the Cable shaft). Note the sliding baffle plate, this could be used to seal off the system. Another baffle is to be seen on the ventilation inlet as you exit the main area of the operations block into the EMERGENCY EXIT area.

It is instructive to compare the Manual Baffle Plate, protecting against Blast and enabling the ventilation system to be sealed, with a modern hydraulically damped system, such as seen in the Longley Lane AC Plant Room (enlarge thumbnail)

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  Where am I?....9 b) Jump to map! For an Emergency Exit!..
Copyright Mark.A.Bennett @ Subterranea Britannica 2000