Crack in the concrete floor slab

The mini thing wouldn't have even caught my attention ;).

The fact is. It is a continuous crack over several meters. This is not to be dismissed per se! After all, you don’t want the ceiling to fall on your head. It needs to be checked whether there is a steel beam or a load-bearing wall of at least 17.5 cm under the crack. One should probably have an expert examine it on site. The hundred (0.5h work + travel) would probably be worth it to me. Nevertheless, to me it looks like settlements at the outer flanks of the house. So there must be a wall underneath. After 70 years, something completely normal.

Unfortunately, apparently no one dares to tackle the problem. I called a structural engineer who said a building surveyor has to check it. Then I called a building surveyor who said a structural engineer has to look at it. I have the feeling they are not interested in these easy jobs like you mean.

and what is now under the crack?!!!!!