The phrase "unseen realm" refers to a world or dimension that cannot be seen by our physical senses. It suggests the existence of entities or experiences that are beyond what we can perceive with our eyes or other senses. Full definition
Rather, they are powered by energies from unseen realms; their functionality occurs within the user's awareness. (hydeparkart.org)
The fact that Eve wasn't thrown off by the fact that an animal was talking to her, I think, helps give evidence to that interpretation (which I've heard on the Naked Bible Podcast and also read in Unseen Realm). (redeeminggod.com)
The dead rich man is pictured in Hades (the unseen realm of the dead, mistranslated as «hell» in the KJV), not Gehenna («hell,» the place of final punishment). (rachelheldevans.com)