There are two kinds of damage. Damaged systems that you can repair at sea, and damage to the hull that you can NOT repair at sea. The latter is "hitpoint" damage to the sub. It's not a problem, it's realistic. If you take a near miss from a bomb, say, you could have stressed wleds, etc that won't do the thing to the way the sub behaves, but it might well be a point of weakness if you try and dive deep.
Hitpoint damage raises the crush depth of the sub.
ANY damage you take, even a single 20mm hit hurts your ability to dive deep (though only a little in the case of a single 20mm hit).
If you take a near miss or certainly a direct hit from a bomb. Go home.
If you saw a hole in your boat in external view, go home.
If you see leaks inside the sub after damage has been repaired... go home.
In all the above cases, you can carefully execute test dives, and when you see wierd things like leaks, etc, that's farther than you can safely dive now.
tater
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