When you use "D" to dive, the sub don't stop. You have to use "A" to tell it to use the current depth. Unfortunately, the sub dives deeper still and then comes up to the depth you asked for.
Another way is to click a depth on the depth gauge, it should stop when you get to that depth.
I gave up using "D" because of these problems. I usually set the depth I want using the gauge (slow method) or crash dive ("C") (fast track!). As already said, crash dive takes you down to 70m. You can stop before then by clicking the gauge.
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