It was the same with us. It was done from the outside with sheets and sealing tapes. The cellar stands 1.50m high in the groundwater - everything is sealed from the inside.
So the screed has finally been in since last Tuesday. I hope the temperatures stay like this soon for the exterior plaster.
Only for the front view do I still need to come up with something. The relatively empty left side already didn't please me on the drawing, but it couldn't be helped because the dressing room is there.