In 1805, Williamson, a tobacco merchant and landowner, bought an abandoned quarry and had pillars and tunnels built into it. He then built streets and houses over the top. But no map was ever left ...

A network of tunnels, passages and vaults run right beneath our feet in Liverpool and they each have their own fascinating history. Deep beneath our streets exists a whole network of secret ...

It’s also a puzzle how far out the tunnels stretch beneath Liverpool city centre. Just as there is no documentation on what the tunnels were built for, there is no map to be found either.

A group of volunteers in Liverpool are giving up their time to clear out the city's 250 year-old hidden labyrinth of tunnels.