New South London tunnel completed with TBM breakthrough

The final section of a £1 billion tunnel has been completed under south London, when a tunnel boring machine (TBM) emerged into the Eltham substation.
TBM breakthrough (c) National Grid
The 11km long tunnel will eventually carry electricity cables and makes up part of the National Grid’s London Power Tunnels (LPT) project. When fully operational, it will replace a maze of cables running under London’s streets, which are wearing out and need replacing, but rather than digging up