Now Jesus's teaching here concerning Hades
Which is translated, for the most part, in the New Testament
Hell: A place that is located in the center of the earth

When they asked Jesus for a sign, he said
A wicked and an adulteress generation seeks after a sign
But no sign will be given it
Except for the sign of the prophet Jonah
For as Jonah was three days and three nights
In the belly of the whale
So shall the son of man
Be three days and three nights
In the heart of the earth

So Jesus located it in the heart of the earth
Because we are told that Jesus descended into hell