Slug infested ollas oh no!

I find if I'm going to have trouble with my peppers it blossoms end rot. I'm quite certain my soil isn't lacking in calcium. I'm not always the most consistent waterer. I find smaller peppers do better for me. I also decided to use some homemade ollas.  I put one in the other day. Today I realized I forgot to cover the top hole.  I filled it up surprised it already seemed empty.  I walked by a bit later and it was covered in slugs. I removed them, and noticed more in the olla. I kept coming back  removing slugs.  I'm going to go back out after dark and put the top on.  I hope they will all come out to eat my plants and the olla will not have any more slugs.
This is just so strange to me. I knew slugs like dark moist places, but I had no idea they could survive being under water. Apparently they can.  This olla is made with two small pots. The bottom hole sealed, and the top open to fill.  So there's no way to clean it out.  I like this design for the veggie garden because it doesn't take a lot of space. Now I'm rethinking that, because at least if the top is accessible, I can clean it out.

That really sucks!
I wonder, could you put a pot over the olla , to trap them when they come out.
A ring of aluminum foil around the olla , filled with salt might help.
You could also flood the olla with beer

I also have crazy slug problems (I found one on THE RABBIT yesterday, which I hope is Peak Slug because I just can't imagine what's next. the washing machine?).
I don't use ollas, but my beds are edged with ceramic roofing tiles. Which are the best hidey holes for slugs and snails. In my front container garden, they like to hide in the plastic flower pots.
I can't get rid of the tiles or the pots (like you can't get rid of the ollas), so what I do is try to trap the little monsters. I'll go out on the first rainy night and pick as many as possible, i'll put down traps (cabbage leaves, wooden planks) and then first thing in the morning collect the critters that are underneath. I've tried the beer traps and they seem to be on the same line as slug baits, which in the past i resorted to and found totally useless (and not in line with what I want to use in my garden).

Specific to the ollas, maybe you can cover the holes with screen or pantyhose or something?

I'm going to cover the hole, I meant to, but got sidetracked.  I just wanted to get all the slugs out first.
When I grew up in Washington slugs were always a part of life.  Now I live in California, and don't normally have to worry about slugs.  I guess we got enough rain this year to increase the slug population.