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Considering zombies have no need for air, water wouldn't be a very effective barrier against them.
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For some reason I have to disagree with this statement right here. I'm not the first and foremost expert on zombies, but I do know that they still have a functioning brain, but based on the lowest level. Something has to be powering the brain regardless of whether or not it is a virus or anything such as that, and while I could say blood is needed to power the brain, we've all seen a zombie w/o a lower half and bleeding all over the place to still be active.
The same could be said with oxygen, but when you throw that power souce out the window, what -exactly- does a zombie power itself on? The need to feed is still there, of course, but that is so the body gets nutrition and is able to power itself. So if anything, oxygen is STILL a key component in keeping a zombie still going.
Saying a zombie can live without oxygen would be like saying they wouldn't become a zombie-cicle in extremely cold weather, which in every movie, book, media (etc.) states that zombies can not operate in extremely cold weather.
Case in point, however, I would not run around a zombie infested city or town with a pillow trying to smother them to death either. I'm just saying.
Jam it back in, in the dark.