The Underworld is the in-between Limbo. You can go “downstairs” (the worse place) or you can go “upstairs” (the Better place) and that’s Olympus. Olympus is their heaven, no matter what culture you’re from.
I will believe it when I see it confirmed on the show. If someone moves on, and Olympus is shown again, fair enough. I just think that’s dumb.
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