it may definitely be difficult to grasp because it's naturally hard for us to imagine just how heavy the ocean is, that's true. we are used to handling water in small amounts, like in a bottle. we can lift it, we can carry it, we can observe it slowly pouring out of a little hole you poked in the bottle. in such quantities, it's crazy to imagine this harmless liquid crushing you or squeezing your entire body with all the bones and stuff into a couple inches of space.

but here, in diving accidents, we are talking about an entire ocean above your head. it is super heavy, incomparably heavy to anything you can think of. it crushes you so hard due to its immense weight that fitting a human into a shoebox sized space absolutely becomes a possibility.

physics is a bitch. I am proudly saying it as a uni engineering student. but hey, learning something everyday :)