Sir Ridesalot wrote:

Why did you remove the sewer cover?

Right around the sewer a hole had started to
emerge so I thought maybe there was a leak and
the water had undermined it from below.
But when I looked down there was no water
around the pipe.

Next to this place is a huge construction site
where they have done pile-driving and possibly
the damage had occurred that way. Anyway I put
small stones and pebbles around to get away
with the hole.

--
underground experts united
http://user.it.uu.se/~embe8573