Ghost Dimension S01E08 - Underground World of the City of Caves

The Ghost Dimension team venture underground to investigate the City of Caves in Nottingham.
 The vast labyrinth of tunnels are century's old and have had many uses over the years from tannery's to air raid shelters as well as been living accommodation stretching back to the middle ages.
But what still calls it home? 
There seems to be an angry man that doesn't take to well to visitors.