Well, first of all: If you are a hardcore player maybe you have a rule of thumb that you NEVER, EVER stop your boat while submerged because in RL this would cause boat start to loose the depth control. That's why, if you want just to lay down, nice and peacefull, you have to drive to the bottom. (So no more "plotting" the targets course and after that just sitting there, speed 0, in PD, just waiting the target). So, that's the basic or main reason = In RL you can't keep your depth if your speed is 0.
So, in any case you want just lay and wait, you go to the bottom.
There is exeptions in sea conditions. Sometimes you can find the layer where there is cold, very heavy water under and warm, lightweight water on the top, and - if you can set your boat on top of the heavier water, it's possible to stop the engines and the heavy water will carry your boat. But, this is just an exeption and it's also hard to find these layers even they exist (thinking that germans didn't have a proper tool to measure water temperatures). Also to drive the boat on the layer would not be an easy task.
Hope you can get what I mean, even that my english is not that good.
Greetings,
-RC-
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