Decades ago I saw two men climbing out of a hole in the ground just outside the perimeter of the former RAF Manston. I had always wondered what they were doing there, and last February I took a walk along the now abandoned road in that area to investigate.
I found a derelict ROC Observation Post in a very poor state of repair. The hatch was missing and the entrance shaft was missing its ladder. Even so, the main external features of this bunker were visible: the entrance hatchway, ground zero indicator mount, air vent, bomb power indicator baffle plate. For the ROC personnel manning these bunkers, conditions underground would have been quite cramped but I did not try to take a look here. There are good schematics of ROC posts available online, and the following two web pages give a reasonable overview:
Forewarned is Forearmed: Inside the hidden world of the Royal Observer Corps
Royal Observer Corps monitoring post
Here are photos from my visit on 26/2/2023:
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