system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do strange things happen even in pressurised environments, like in airplanes and submarines, for example the coke can underwater on the front page recently?

Surely if these were pressurised everything would act the same as it would at 1 atmosphere?
gpt
I don't know the video you're talking about. (A link would be useful!)

But it may be relevant that aircraft are not pressurised to 1 atmosphere. They are normally pressurised to the equivalent of 8,000' altitude (rather than the 35,000' altitude they actually fly at).

I have no idea if the same is true for submarines...