Submarines also have to take care to keep atmospheric pressure in mine. If one dives down far too deep and is thus exposed to pressure that the submarine is not built to handle... well. Let's just say that you would not want to be inside the submarine when that happens.
[please for the love of god do not reenact oceangate here in escordvi guys]
no subject
[please for the love of god do not reenact oceangate here in escordvi guys]