A new tunnel is about to be dug under the River Thames

A new tunnel is about to be dug under the Thames to the east of London — to help move electricity around the country.
Typical electricity tunnel (c) National Grid
There’s already an electricity cable tunnel under the Thames between Gravesend and Tilbury, but it is more than 50 years old and is coming to the end of its useful life, and the National Grid says that upgrading the cables inside the tunnel isn’t feasible anymore.
They filed a planning application last year to dig a n