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The will come up for air because they can swim, therefore they won't drown...
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They can still drown, which is the whole point of this conversation.
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No they can't; they're too good swimmers. They are born in the water; they can't drown. They're just too good at swimming; they will always swim to the surface. They're not just gonna stop being able to swim when they can't even walk and have been swimming from birth and have been designed to swim from inception... Are they?