The Thames Tunnel is proposed to be 7.2 metres in diameter, about 67 metres deep and our preferred route is approximately 25 kilometres (15.5 miles) long – making it one of the largest and deepest tunnels under London.
In general, the tunnel needs to follow the route of the River Thames so that it can be connected to the combined sewer overflows (CSOs) that are located along the riverbanks.
Following the route of the river also means that we can make use of the River Thames itself to transport materials and minimise the number of existing buildings and structures that the tunnel will pass beneath.
The animation and the information paper below describe the types of site that we need and how we will build the tunnel: