I downloaded the swimthrough and looked at the diary puzzle, and I'm kinda stuck at deciphering the diary and I like some further help with it.
I forgot to mention in the swimthrough that the solution is only valid for the English version of the game. If you play in German, the password is different.
If you need some tips on how to proceed, please have a look at my reply to Steffko on the jam comments page (scroll down to the bottom):
https://itch.io/jam/advjam2023/rate/2110707 (ek)