New tunnel starts digging under south London

A tube train sized tunnel has started being dug under south London running between Wimbledon and Crayford.

Huge tunnel to be dug under South London

A 20 mile tunnel almost as big as a tube tunnel is to be dug under South London, linking Wimbledon to Crayford near Dartford, via New Cross.

The private monorail tunnel under North London

Under North London, there exists a private underground monorail service, some 20km long running from Elstree to St John's Wood in the centre of town.

The day a huge power cut left thousands trapped on tube trains

It's the ebb of the evening rush hour when engineers carrying out planned work on the National Grid's electricity network report a problem with one of the transformers at the substation. Within minutes most of South London is plunged into darkness, mainline train stations close, and over half the London Underground shuts down.