Travel from London to Wales now faster and greener
Severn Tunnel - First GWR train to Cardiff, source: Network Rail
British infrastructure manager Network Rail has completed the electrification of the Severn Tunnel. As a result, the entire route between London and South Wales is powered with overhead wires. It allows the train operators to speed up their services and to make them more environmentally-friendly.
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This should read that the length of the tunnel that is under the river is 3.6km. The article reads that the tunnel is at a level of 3.6km below the river. That would be a very deep tunnel!