Nice mock-up! That's the sort of thing I had in mind, it just adds to the claustrophobia! I don't think it should be a frequent occurance by any means as it requires cracked batteries leaking into the bilges with sea-water also present therein (or vice versa).
Other interesting areas would be the effect of depth charges going off below the boat causing the U-boat to sink violently (gas infused air confers less buoyancy, so a trimmed boat will sink like a stone in this scenario.) Basically what I'm after is generating situations to cause the crew more non-lethal problems to contend with, be it loss of electrical power, internal fires, fumes, smoke, CO2 management, chlorine, more progressive damage to U-boat to near misses, breakage of instrumentation, injury of personel, leakage of periscope glands and so forth.
At the moment it's more a binary situation, either everything is working - or you're suddenly dead...
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