Moin,
the food´s disappearance is directly linked to the amount of fuel you have. So, the same approach could be used to make the ice accumulate around the conning (inversely proportional to the amount of remaining fuel). Unfortunately there´s no trigger for 'above' or 'underwater' to make the ice disappear when diving. But there would be a way to link it to the sub´s depth, similar to the way the helmsmen appear/disappear in OH´s last released (and already outdated) version.
Regards,
DD
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