Quote:
Originally Posted by -Pv-
When blowing ALL the compressed air you have stored forcing all the water out of the ballast tanks, diving immediately without charging means you have lost all the stored pressure necessary to bring you back to the surface using ballast tanks. Since there is no compressed air, you have also lost the ability to trim and control your depth. You can take on water to sink, but you cannot push it back out again. Planes and propulsion are not enough to compensate for the water you have taken on to dive. Your boat essentially becomes a rock with an engine.
Other than these two reasons, you should not be blowing emergency.
As stated above, you should only do this to save the crew and in most cases, you have probably lost the fight.
-Pv-
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American SSN's do not use AIR to change the buoyancy (weight) of the ship. Using air is NOISY evolution in most circumstances and that's why is it not normally used. In the real world, after an EMBT blow and you wanted to re-submerge, you would just open the main ballast tank vents.