The Greek word Hades refers to a different place than Hell. Hell is the final place for those who are not going to Heaven, Hades is the place of torment for the souls of those who are going to go to Hell. Hades is the place of the dammed, but only their souls are there, but when Jesus comes again and raises everybody’s body from the dead, He will reunite body and soul, for both the saved and unsaved. And while the saved will receive a glorified body, the unsaved will receive their old body in whatever state they were in when they died, and they will be cast into the Lake of Fire which is Hell, or Gehenna.
While Hell is the Lake of Fire or Gehenna, Hades is also refered to as Katotata or just Kato, which are Greek words that mean ‘lower region’. In the Greek version of the Apostle’s Creed it is Katotata, Paul also refers to it in Ephesians as Kato. Hades is Sheol in Aramaic.
Hades is probably in the center of the Earth since Jesus said, “Just as Jonah was in the belly of the whale for 3 days and three nights, so must the son of man be in the heart of the earth for three days and 3 nights.”
It is unfortunate that Hades has been translated into Hell in the past because it has caused confusion for many. But they are different places, and Hades will be cast into the Lake of Fire one day, as St. John tells us in Revelation.
There is even another place of torment for the demons, it is called Tartarus. It is mentioned by St. Peter. And again, it is unfortuante that it has been translated into hell by some.