Oecumenius

And the sea gave up the dead that were in it, and Death and Hades gave up the dead that were in them, and each was judged according to their works. Those who disbelieve in the resurrection of bodies mock both us and our doctrine that these bodies will be raised again, as if this were not only difficult but wholly impossible. And they say that each of the bodies on earth is composed of the four basic elements, fire, water, earth, air, and that bodies dissolved by death return to those elements from which they were originally formed. …

Commentary on Revelation ↗

Methodius of Olympus

Consider, he says, whether too the blessed John, when he says, "And the sea gave up the dead which were in it: and death and hell delivered up the dead which were in them," does not mean the parts which are given up by the elements for the reconstruction of each one? …

From the Discourse on the Resurrection ↗

Augustine of Hippo

Who, now, are these dead people who were in the sea and whom the sea will give up? Surely we are not to think that because a person drowns, his soul does not go to hell, or that his body is preserved in the sea, or—what is still more absurd—that the sea keeps the good dead people and hell the bad ones. No one could entertain such a notion. Surely those are right who take the sea in this text to stand for this world of ours. …

City of God 20.15 ↗

Bede

And they were judged, each one according to their deeds. This signifies that bodies will be gathered from the earth and souls from their places. The good are designated by the name of death, which has only suffered the dissolution of the flesh, but not punishment. The wicked are designated by the name of hell. It can also be taken literally, that all bodies, even those that the waves have swallowed or beasts have devoured, will be resurrected. …

Commentary on Revelation ↗