heavy industries
After an explanation of the system and its construction, we were invited to visit the underground surge tank.
Outside and at the far side of the field, an oblique concrete structure, like a sunken cube, serves as the entrance to the access shaft. A small black and gold plaque at the side listed the dimensions: 177.1 metres long, 78.0 metres wide, 25.4 metres high.
A hundred or so metal stairs down, the temperature steadily falling, then into the middle of the massive, dimly-lit cavern, where an array of giant columns towered, unshakeable.