There are many scriptures that show Hellfire is deep down in the earth.
FACTS: The depth of the earth is a thousand times larger than the atmospheric surface of the earth where we living on. The world's deepest hole is nothing but a scratch on the earth's surface.
Living sea creatures such as worms have been found in the hottest and darkest part of the ocean depth, also home to volcanos.
In 1980s, an expedition was carried out, excavators dug deep into the earth until the rig burst into a large opening and could go no further for the length of it. They heard noises. Unsure, they put in a mic and to their amazement, they heard what seemed the wailing of millions of people in pain. When it was published on the newspaper, the US government took flight and stopped it's distribution. The excavated site was also closed by the forces.
Jesus said the worms in Hellfire cannot die. Basically immortal. Scientists have also discovered some sea creatures with immortal life.
Are you convinced?