"Attention, Attention!!! Have you upset stomach you can not access", I'm thinking someone with gas was not very welcome in that small room with poor ventilation.
I don't know what that says but I think it could have been a secret place to hide Jews during that time when all of the Jews were being sent to places to be killed and the alarm was used to warn the hiders that there was someone looking for them. That is just an idea
Sometimes words are not meant to be taken literally; simply because a single word can have multiple meanings, especially when one it is trying to communicate thoughts. "It's not what you say; it's how you say it".
Norwegian: Note you have bad stomach has not allowed.
Atleast that's what I got.
You don't have access.