Fish survive by converting water to oxygen via gills composed of many tiny blood vessels. We really have no idea how Wolverine's healing process works. It's possible his healing powers allow him to process just enough oxygen out of the water to make him recoverable. Of course, that would imply he couldn't recover from being in pure vacuum for an equivalent period.
It's also possible that his powers allow him to go into a state of hibernation when near death. For instance, there's no reason why Wolverine couldn't be frozen and revived. All the problems of cryogenics should go away when a person has super-healing abilities. Perhaps his healing abilities also come with the ability to remove and keep out heat in order to create a temporary frozen state.
It's also possible that his powers allow him to go into a state of hibernation when near death. For instance, there's no reason why Wolverine couldn't be frozen and revived. All the problems of cryogenics should go away when a person has super-healing abilities. Perhaps his healing abilities also come with the ability to remove and keep out heat in order to create a temporary frozen state.
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