This remarkable shelter in Enfield, Middlesex is dug so deep into the ground that it needed steps to access it. The current owners of the house discovered it when they bought the house in late 2018.
Why was it built so deep? One can only guess that the house was owned by someone – maybe a builder – with the skill and the time needed to dig so deep and build the entrance steps. And the house was only around 4km from the Enfield Rifle Factory, so the occupants probably feared they they would be subject to frequent air raids.