Overview: This week, Rob reveals a mysterious side to Englandʼs capital that very few people ever get to see. Beneath the bustle and noise of the sprawling, teeming, traffic-congested city streets lies a world of dark forgotten places. Prising open unassuming entrances and overlooked doorways, he finds a labyrinth of tunnels, vaults and even secret places that the public were not supposed to know even existed.