ᐅ Basement / Excavation – What Kind of Shaft Is This?

Hello everyone, I am new here and have a house south of Leipzig. I believe it was built in the 1950s or 1960s. It has a basement and two floors. Right next to the building, there are three shafts. These extend below the basement level, and I have no idea what they were used for. The shafts are made of brick and are connected to each other through openings. The inside appears blackened, apparently from use. Each of the three shafts is covered on top with a metal plate measuring approximately 60cm by 40cm (24 inches by 16 inches).
I took some pictures.
Maybe someone has an idea what they were used for?
Thank you very much

I would guess it’s a septic tank.

If the building year is a bit earlier, it could still be a soakaway pit.
Ask the old neighbors when the sewer system was installed.

Nida35a schrieb:

If the building year is a bit earlier, it could still be a soakaway pit.
Ask the older neighbors when the sewage system was installed.

The majority of the buildings suggest this.

Yes, I just found out that the house was built in 1937.

You can continue to use it as a rainwater cistern (add a garden scoop of Ammovit every autumn), or fill it in.