Fibre network firm Geo has added a further 50km of dark fibre to its network in the London area to offer speeds of up to 10Tbit/s.

The extension runs through areas in the south west of the capital, including Chiswick Business Park, Hounslow and Hammersmith, via the Telehouse West datacentre in Docklands and another facility in Slough.

Cables for the deployment run through the sewer network 30 metres below street level, which the firm claims removes the threat of accidental damage and provides high levels of security and resilience.

"Geo is continuing to execute an aggressive network expansion programme to meet the growing needs of our existing customers and strengthen our proposition to new clients," said Chris Smedley, chief executive of Geo.

"Chiswick Park opens up many new opportunities for us, and we are delighted to be early partners with the two leading datacentre organisations, including Telehouse, both of which operate exemplary facilities and are highly regarded in their field."

Geo claimed that running its network via the Telehouse West datacentre adds another level of resilience by offering a second route for connections other than the Slough datacentre.

Geo was mentioned by culture secretary Jeremy Hunt yesterday as one of a number of firms providing high-speed infrastructure through innovative solutions, in this case running fibre through the sewers.

"I know there have been some interesting pilots, whether by Geo in London, Fibrecity in Bournemouth and Dundee, or Virgin in Berkshire," Hunt said.