But whatever Ringwraiths happen to be composed of, would it be so dense that they would remain at the bottom of the sea after being thrown in? (assuming of course that they can't swim) I would assume that if they were thrown into the sea/other body of water and Sauron were still around that they would remain open to his summons and in response they would float/drift to the surface of the water and find their way back to him in the way that they did after the Bruinen incident.
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