TSIL436 = The Secret in Locker 436
The BBC has a powerful February 2020 video piece on the deep underneath of London, where there’s a hidden network of tunnels.
It’s all about electricity–
With Londoners encouraged to buy more electric cars and London needing more energy, ‘power tunnels’ have been created under the city’s streets.
The first phase, completed in 2018, built 20 miles (32km) of tunnels carrying high-voltage cables. The next stage is due to start construction this year.
Coming soon: I’ll take a look at what else is below the UK; there’s a fascinating society for studying man-made and man-used underground places. They discover mines, tunnels, nuclear bunkers, caves, military defenses and more….