In game, your boat will slowly sink at extreme depths.
In other words, the deeper you go, the faster you have to turn the screws to maintain depth.
This is most prominant in the IX boats. Its barely even noticeable in the VII boats.
As an experiment, make your crush depth like 275. Go down to 260 meters, go to silent running, and make your speed 2 kts to reduece RPM - hence run more quietly. Over short period time you will see your boat slowly lose depth. This is remedied by increasing speed.
Stay down there long enough, and you'll find the boat becomes less and less responsive to depth changing requests. At some point the only way to move topside is to put the boat at flank speed. I have been in a situation at least once where this didnt work, and i had to blow ballest. Whats neat, is watching the boat start to move forward at an incline (doesnt happen all the time), bow up, stern down, like its dogpaddling.
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