Repair holes in the concrete floor - underneath there is rubble and sand

Would suspect that this is actually rubble and sand... take a vacuum cleaner and just hold it in there (?)

Hi, yes, it is outdoors. I also can't say for sure if it is concrete; it is a classic floor. Unfortunately, I am not familiar with the variety of materials that exist. Therefore, I would like to approach the problem in a "lawnmower-style" way. In a few years, maybe everything in that corner will be replaced. Until then, it should be watertight because I don't know if there is only soil underneath. Right next to it is our house, and that should stay dry. Regards. Thomas.

So there's nothing underneath? No basement or anything like that? Just soil...? Assuming yes, that's the case: This concrete floor (functioning like a paved surface) does not contribute to the house's watertightness. The house itself must be sealed. A repair is only necessary for cosmetic reasons.

Describe the application to the building material supplier you trust and buy a sack of screed cement (or similar) there. You scratch out the crack until the edge is firm, no longer crumbly. Then either sweep thoroughly or vacuum. Slightly moisten and then you fill it in and smooth it out. Compact properly (tap, tamp) while doing so. Let it dry, done.

Mhh, judging by how the floor looks, I assume that they simply poured the cement floor over the rubble - real botch job ... otherwise see above

That will apparently be a device as a parking space. That’s how it was done in the past.
What is supposed to be underneath? A piece of basement?
I would be thinking about what is going on behind the stacked white sand-lime bricks.

Regards

...thanks thanks. Yes, the stones are on the agenda. But it is very full. Thanks to your tips, I will probably actually just leave it as a quick fix and simply fill it with cement mortar. Clean it first and apply some bonding primer and maybe someday something completely different that also looks good... Grüüüße