After eight years of construction, the £5 billion Thames Tideway Tunnel in London has reached...

Published: 2:15 pm April 3, 2024
Updated: 11:46 am October 8, 2025
UK’s huge new £5bn tunnel finally finished but tourists will never be able to walk down it

After eight years of construction, the £5 billion Thames Tideway Tunnel in London has reached completion, representing a significant step in addressing sewage pollution along a section of the River Thames. The 25km-long super sewer, designed to mitigate the impact of storm sewage spills, is expected to substantially reduce pollution levels once operational.

Despite its completion, tourists will never have the opportunity to traverse the tunnel, as its primary function is to manage sewage flow. Tens of millions of tonnes of storm sewage currently overflow into the River Thames annually, causing environmental concerns. However, with the implementation of the Thames Tideway Tunnel, these spills are projected to be significantly reduced, if not eliminated.

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