Interesting video. "2000 pair cable"
The previous site of the company I work for was a BT exchange building, built sometime in the 50s or early 60s. A big section on the 1st floor was rented out to us as a data centre room, with some office space next to it.
The winching point where they bring up the huge cable drum in that video looks identical to the one at our first floor data centre room. I suppose that's what it was there for!