Augustine of Hippo
But who are these dead whom the sea gave up? It cannot be supposed that those who die at sea were not in Hades, or that their bodies were preserved in the sea.
Still more absurd would be the supposition that the sea contained the good dead and Hades the evil dead. To whom would such a thought occur?
Some quite reasonably think that in this case the word sea is used in the sense of the present age.
Thus, to make us understand that together with those who rise, those whom Christ finds still here in their bodies will also be subject to judgment, he called them dead also.
He means both the good, of whom it is said, "For you have died, and your life is hidden with Christ in God" (Col 3:3), and the evil, of whom it is said, "Let the dead bury their own dead" (Mt 8:22).
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They may be called dead simply because they bear mortal bodies. For this reason the apostle also says: "The body is dead because of sin, but the spirit is life because of righteousness" (Rom 8:10).
By this he shows that both exist in the living man who is in this body: a dead body and a living spirit.
John did not call the flesh mortal, but dead, although a little later he calls these same bodies by the more usual word, mortal (cf. Rom 8:11).
Thus the sea gave up the dead who were in it. That is, the present age gave up the people who were in it, because they had not yet died.
"And death and Hades gave up the dead who were in them." The sea gave them up because they appeared as they were found. Death and Hades returned them because they were summoned again to the life that had already passed.