Interesting idea that the snake had two legs in that Egyptian drawing. I always thought of it more like a lizard. Maybe the Egyptians knew some things we don't.
As for hollow earth, I have wondered if "under the earth" meant bugs and animals that live under ground, or if it included more. "Under the earth" and "in the earth" could mean deeper than just where animals dwell. Just because under the crust of the earth is fiery hot and creates volcanoes doesn't mean it's like that to the core of the earth. That is scientific supposition.
Then there's this in the LDS Doctrine and Covenants section 133:
20 For behold, he shall stand upon the mount of Olivet, and upon the mighty ocean, even the great deep, and upon the islands of the sea, and upon the land of Zion.
21 And he shall utter his voice out of Zion, and he shall speak from Jerusalem, and his voice shall be heard among all people;
22 And it shall be a voice as the voice of many waters, and as the voice of a great thunder, which shall break down the mountains, and the valleys shall not be found.
23 He shall command the great deep, and it shall be driven back into the north countries, and the islands shall become one land;
24 And the land of Jerusalem and the land of Zion shall be turned back into their own place, and the earth shall be like as it was in the days before it was divided.
25 And the Lord, even the Savior, shall stand in the midst of his people, and shall reign over all flesh.
26 And they who are in the north countries shall come in remembrance before the Lord; and their prophets shall hear his voice, and shall no longer stay themselves; and they shall smite the rocks, and the ice shall flow down at their presence.
27 And an highway shall be cast up in the midst of the great deep.
I think that's something else that could be simply people in Alaska, Canada, Russia, etc. or it could mean more. The water driven back to the north countries, but there are people there who smite the ice and make a highway in the midst of the ocean. If that is people coming from the center of the earth, perhaps their prophets lead them out so that they can be safe when the earth is rolled together as a scroll.
Obviously, I don't know, but I think it's like Isaiah (when he described passenger planes and war planes) where it isn't clear, but when it happens, we will clearly see that the scriptures were as descriptive as they could be given the era in which they were written. I think it's the Book of Mormon that says that when Isaiah is fulfilled, people will then understand what he's saying.