It could potentially serve thousands of companies across the city.
Energy company SSE have entered into an agreement with Thames Water which will see them lay broadband cables throughout London's extensive sewer system.
It's a direct response to a recent ruling which stated Openreach didn't have to open up any of their unused fibre networks to other UK providers.
Firms have therefore been required to get creative with their work as it's estimated that as many as 3,000 different companies across the capital are battling for better connectivity.
The huge sewer system which was developed by civil engineer Joseph Bazalgette in the 19th century is situated around 10 feet under the ground and would allow SSE to offer “bespoke, customer-driven network build-outs” to companies all over London and beyond.
Another advantage to positioning it so deep is that it becomes much less susceptible to tampering and sudden power outages caused by extreme weather or faults with other provider's technology.
“Our Victorian sewers are already home to a number of pipes and cables belonging to other utility companies and we’re glad to also now be supporting SSE Enterprise Telecoms,” said Richard Hill, Thames Water head of property, Thames Water.
“Reducing roadworks and traffic congestion is something hugely important to us, so it’s great to help a fellow utility company do the same by allowing them to make use of our existing infrastructure.”
Source: City AM
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