The NCRI also said it smuggled out a photograph showing a 1-foot thick lead-lined door
that shields the complex from radiation, and that the secret rooms and hallways are insulated for sound and radiation leaks so that they would remain undetected.
An interlock was incorporated into the custom, automatic, horizontal-sliding, lead-lined doors
that contained this space so one side could only open at a time to prevent crosscontamination.
After marrying, Paul and wife Denise started a security technology business in Cornwall - an enterprise which ended for Paul with a permanent injury after some lead-lined doors
fell on his spine.