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Detail of the water quench system on the roof of the bunker. It is fed and controlled via a valve on the interior of the bunker.

Picture 2 of 2.

If you look closely at the underside of the watch quench "ring", you can see the holes through which water would flow.

During my second visit, there was some manner of surveying being performed, and there was a temporary guard rail constructed on the top of the bunker.