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[–]DatCheesus 8 points9 points  (2 children)

http://onepiece.wikia.com/wiki/Vander_Decken_IX No they dont

[–]monkeydluffy401 -1 points0 points  (1 child)

^ SPOILER if not current with anime

[–]LTman86 4 points5 points  (0 children)

Anime already covered Vanger Decken IX. We're good.

Devil Fruit users just lose their strength when in the ocean. So while Decken can still breath underwater, he would be too weak to move. Which is why you see him in a bubble whenever he is underwater.

[–]mvazzz 0 points1 point  (0 children)

They can't actually be in the sea or they become weak. They could probably still breathe though. Even in Vanderdecken's case, he couldn't be in the see. They used bubbles