What Lies Beneath

A recent source has sent me some curious information regarding tunnels beneath London.  London to say the least riddled is with tunnels from the Underground to its notorious sewage network.  My source found a tunnel connecting his cellar direct to the river Thames, ending close to Wapping docks.  On the way back he slipped and nearly knocked himself senseless against what seemed to be remains of old Roman ruins, see fantograph taken below:

It was however fortunate that he slipped because otherwise he wouldn't of spotted something odd on the opposite tunnel wall, see fantograph taken below (click on it to see full size):

See the button like shape in the centre to right of the an evil looking head, not a button but a knob.  When my source turned it forty five degrees clockwise into the nine o'clock position a section of the tunnel wall swung open revealing a second tunnel.  After a quick investigation of this second tunnel however showed that it wasn't just one tunnel but many.  My source had had the forethought to take a compass with him, the second set of tunnels heads mostly in a north eastly direction.

My source took samples of the red paint used to make lettering and symbols on the tunnel wall, he has just literally confirmed that it isn't paint but human blood.

The source was also quite surprised by the lack of rats in the tunnels being that the main tunnel leads directly to the river.