I had the impression it appeared in other mythologies, whereas the Christian "Hell" is either on "a different plane of existence" (same for the "Heaven") or it doesn't exist yet (and will be created after the "second coming" and "Final Judgement"), depending who you ask.
The idea that Christianity is contained entirely within the Bible is a fairly new idea within Christianity (its one of the new doctrines that separated some branches of Protestantism from the established Catholic -- as well as Orthodox, and even other Protestant -- belief.)
There are of course no actual references to "hell" in the original texts at all. Several other words are used in the old and new testaments. Which of these correspond to "hell" is up to the translator and the translations don't agree. Some of the words (Hades) were literally underground. Others (Gehenna) not so much.
Wikipedia has a discussion about it. It seems like the "literally inside the Earth" interpretation is trending downward, which isn't surprising since biblical literalism in general seems to be declining.
https://en.wikipedia.org/wiki/Christian_views_on_hell#Hell_a...
AFAIK, Hades isn't in the original text either; I do know it appears in Greek OT texts as a translation of the Hebrew Sheol (while the Hades of Greek mythology is literally an underworld, the Sheol of pre-Christian Jewish belief is, again AFAIK, not.)
> It seems like the "literally inside the Earth" interpretation is trending downward, which isn't surprising since biblical literalism in general seems to be declining.
The "literally inside the Earth" interpretation isn't particularly grounded in Biblical literalism (though the groups holding to those two beliefs may overlap significantly.)
It seems like Sheol was considered to be underground, though, since it referred to the grave.
https://en.wikipedia.org/wiki/Sheol#Judaism
Again, though, this is just my understanding. I'm not a biblical scholar and I can't read Greek or Hebrew.
Did he have any opinion about the linked article WRT geologists not finding much evidence of Hell below the surface? I've heard widely varying comments from Christians regarding Hell so I can't even make a prediction.
Not trying to get you in trouble with coworkers, but it is interesting to read alternative interpretations of reality, which is why every post so far is about your coworkers not the article itself. I liked the article. Not bad.