Underground waterproofing

Hi all.

I have a question about building underground. Is there a way to have an underground structure and not have the water in it? I've tried various things and all have water still in the build.

Thanks.

Err...one, it's not possible to have an actual underground structure, so right off the bat, no.

As for having structures with prim-ground over them without being underwater, it's totally possible, if the ground is high enough. Water is at one height for the whole sim. If you build a mad scientist's lair into a mountain, you probably won't have water in the basement. If you build it on a beach, that basement's going to be a swamp.

It's not possible to prevent water from entering specific places, and no prim setting blocks the fog effect reliably without any side effects.