A hole has appeared near the telephone pole outside my home. I had a word with the diggers, and they said that it's to connect the underground BT duct to the manhole that BT put in a few months ago.
The hole is square.
As far as I know, they haven't unblocked the duct. But maybe they have unblocked it and I didn't notice. You can see the pipe at the bottom, down which the cables run.
Still, it shows they're still trying.