A British man has unveiled the astonishing underground construction project hidden beneath his back garden, concealed by a manhole cover.

Dave Billings, who lives on a former World War II army camp, has been documenting the progress on his YouTube and TikTok channels. Following years of building off-road race cars and Motorsport Roll cages, he embarked on a new endeavour – creating a 40-foot long tunnel that he claims is nearing completion, connecting a series of bunkers to his main…