Did you take any damage? Can't imagine why you couldn't pull out. What boat were you in?
One thing that helps, mostly with damage, but helps to pull out of deep dives is to use the periscope button. Don't know why, but if you just set your depth to rise or hit surface often you stay still, while hitting the periscope button will bring you up. This works with a out of control dive while damaged, but once you get up, you head back down.
Did you have any extreme angle to your dive. If you are out of control going down by the bow, use reverse flank. Using forward speed will just send you down faster. If you're going down by the stern, obvious flank forward or whatever amount of speed will stop the out of control dive.
Almost always blowing tanks, periscope button and using speed opposite the dive plane will bring me up.
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