The blow ballast when taking too much damage was an emergency, last ditch manouver to save the crew. As stated by dev team related to SH3, once you have surfaced, be prepaired to fight it out on the surface and run to repair port. If you cannot, you will lose the boat anyway. Trying to submerge again after taking leathal damage is futile. It was this way in SH3 and I expect also in SH4.
Play smart and keep your damage low. Practice and maximize your stealth and evasion techniques. Measure your risks against return if successful. Keeep your crew fit and effective. If all else fails, RESTORE SAVE.
-Pv-
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