A questioner asked what I thought of the Hollow Earth hypothesis that says the planet Earth is either wholly hollow or otherwise contains a substantial interior space.
My answer is that it is plausible that there are significant inclusions (hollow places) in the interior of the earth. The Bible teaches that there is a bottomless pit (a globe circling tunnel with an entrance shaft?), and such a structure is an inclusion by definition. However, compared to the total volume of the earth, it is probably negligibly small.
There are other inclusions, however, that probably are more substantial than the bottomless pit. My theory is that the center of the earth is hyper pressurized water and is not hollow. The center of the earth could then serve as a reservoir for supplying the worldwide irrigation system (fountains of the great deep) implied in Genesis 2:6 and Isaiah 30:25, 41:18. An underground irrigation system is a series of tunnels underlying the whole earth and if it existed, it would provide a substantital amount of inclusions in the earth. The existence of an underground irrigation system that would presumably need to be supplied from below and thus would support a water core for the earth is supported by an article I recently read on natural gas. The article said that natural gas cavities underlie practically all of North America, and these cavities are interconnected. I believe these cavities are the remains of an underground irrigation system that was rendered inoperative by the sediment from the Flood. The underground irrigation system’s operation will be restored on the new earth. These natural gas caves, of course, are a significant volume of subterranean cavities, though they are not in the center of the earth.
There is further evidence for an underground irrigation system and water at the center of the earth to be found in the existence of hot springs. There are known hot springs (380 C) in the great deeps of the oceans that supply minerals, particularly hydrogen sulfide, in sufficient quantity to support an ecosystem that DOES NOT rely on photosynthesis! Clearly, if a ecosystem can exist off various nutrients coming up from the interior of the earth in the absence of sunlight, this has to be by design and was therefore in place by Day 6 of the creation, because God says He created all things in six days (Ex 20:11). These deep sea springs (Job 38:16) probably at one time were not confined to rare instances in the great deeps of the oceans.
