Excavation up to the sewage pipes

Good day,

I am not building myself, but my neighbor is. His excavation pit has now been dug out. Since a basin is going under the house, the excavation was done beyond the property boundary. In the process, the cable connection was cut through without informing anyone. It can happen, it has been repaired.
Meanwhile, the earth excavation has grown to about 20 meters in length and up to about 50 cm close to our sewer pipe. At the inspection shaft, it is still 10-20 cm. I am now concerned that the earth may settle or shift now or at some point in the future and that the pipes could break. How does one document something like this or how should one behave?

Thank you very much

Good evening,

I am now concerned that the ground might settle or shift now or at some point in time and the pipes could break. How does one document something like that or how should one behave?

I was convinced until just now that today is 27.02.2015 .... isn't it a bit early for an April joke or do you actually mean your question seriously?

Rhenish greetings

I have no idea either and would ask myself the same question.

The question of Fluidum or construction expert?

Oh, from [Fluidum].

Well, if you've ever seen sewage pipes live, even if it's in the hardware store, and have carried a sack of potting soil and therefore know how much soil weighs... then the question is unnecessary... so I'm fully on the side of [Bauexperte]