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I think about kinsman and the awesome Hollywood physics used in this movie
https://movies.stackexchange.com/questions/31162/why-do-they-go-to-the-toilet-and-put-the-hose-in-it-to-breathe#31254
I love this scene, because zero people during production remembered what happens when you out more water into the toiletbowl.
In universe I want to guess they added pressure to the back side of the system to balance out the water vs air pressure since it's part of the training system. That said, it was probably just movie magic bs.
That was interesting. I should see this movie now.