You will have heard of the River Thames, the famous swathe of grey that cuts a watery path through London.  You may even have heard of several of London’s prominent canals, such as the Grand Union Canal and Regent’s Canal. But, you probably will not have heard of the mysterious River Fleet that meanders through eerie tunnels beneath the city.

The Fleet and its Victorian tunnels are available for exploration, but are not for the faint of heart or sensitive of nose.

For more stunning subterranean images follow the full article here.

[div class=attrib]Images courtesy of Environmental Grafitti.[end-div]