Basically, Jesus “preached” His victory over sin and death to the disobedient spirits in held captive in Sheol/Hades (the grave/hell).  According to the parallel story of Lazarus and the rich man in Luke 16 and Jesus’ promise to the repentant thief on the cross in Luke 23, we know that there was a place called “Paradise.”  In Ephesians 4:8 we find that Jesus led a “host of captives.”  It’s apparent that the guests of Paradise were transferred to heaven while the prisoners of Hades were left behind for the Great White Throne Judgment of Revelation, when death and Hades are tossed into the “Lake of Fire.”