Natural cellar / Earth cellar

Yes, the wastewater pipes are made of cast iron

Cast iron wastewater pipes are definitely not the original piping. In the past, stoneware wastewater pipes were installed.
Some can be cleaned, others repaired with a liner.

You need to have the drinking water pipe inspected.

Hello,
attached are the photos.
what can you tell me about them, does anyone know this?
does anyone have experience with this?

Thanks and regards
Daniel