The left side is an effective delta P based trap
https://www.youtube.com/watch?v=AEtbFm_CjE0
TPK incoming
The left side is an effective delta P based trap
https://www.youtube.com/watch?v=AEtbFm_CjE0
TPK incoming

Left is difficult because you have to hold your breath while picking the lock, right is difficult to get to the ledge.. tough call
Would they even be able to unlatch it with all that pressure?
There are much meaner variations of this.
Make the right area split into two, such that as it fills with water, the players are forced into the section that DOESN'T have the ladder.
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