Jamieson, Fausset and Brown on Revelation 20:13

13. death and hell--Greek, "Hades." The essential identity of the dying and risen body is hereby shown; for the sea and grave give up their dead. The body that sinned or served God shall, in righteous retribution, be the body also that shall suffer or be rewarded. The "sea" may have a symbolical [Cluver from Augustine], besides the literal meaning, as, in Re 8:8; 12:12; 13:1; 18:17, 19; so "death" and "hell" are personifications (compare Re 21:1). But the literal sense need hardly be departed from: all the different regions wherein the bodies and souls of men had been, gave them up.