The Mole Man of Hackney.

His old house anyway.
Fifteen or so years ago the mad old bloke who lived here, as well as filling his house and garden with ton upon ton of rubbish like on the telly programmes, used to dig tunnels. He would dig outwards from his cellar under roads, gardens and houses of the neighbourhood. He had been doing it for years and his antics were only uncovered as it were, when someone's garden disappeared.
I don't know what became of him, placed in a care home with a concrete basement I imagine.