Well to be fair, the zombies are less believable with each passing day. There's no way they'd still be animated after a year. Where are they getting their sustenance/energy from? And if they are rotting and falling apart how can they still move? Lastly how do their jaws still have strength to bite, if their heads explode like overripe melons from a hit?
Considering all those inconsistencies they'd probably handle ocean water and sub zero just fine.
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