Why can I not dive after an emergency blow?

[ETR3(SS)]

Originally Posted by XenonSurf

But one scene from Red October is quite realistic: vertical evasion, thus getting the sub ''out of the water with big waves", is a consequence of changing depth and surfacing at max. speed to evade torpedos, you lose a significant amount of speed by doing so, so a good skipper would avoid that making the sub stabilize at 50 feet or so before releasing a noisemaker and going down again. In reality it's so that you cannot do that too often in a row for the sake of your crew... What are the effects of going from 800 feet to 50 feet in 2 minutes and this more times? I don't think this ends well...

It's not realistic at all really. Once you hit the chicken switches you're going to the surface, there's no stopping it short so you can remain submerged. Note that EMBT Blow stands for Emergency Main Ballast Tank Blow, not tactical but Emergency.