Oh, I just forgot to say: Going to flank and then putting the ballasts to +30 and also the planes at +30 will get you to surface quite as quickly. And also the contrary when on surface and you want to dive (-30 / -30), so no need to use the 'Blow Emergency tanks'.
In practise it's not that long: just steer a big angle with S and hit E multiple times to make the fastest possible surfacing. Then hit X to level.
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