A hollow Earth would not have enough mass to hold on to an atmosphere by gravity, and all the surface water would boil away. If the crust had enough mass to make up for the hollow centre, there would be no magnetic field, which is generated by the Earth's liquid iron interior. Compasses wouldn't work, and some migratory animal species might get lost, but that would be the least of our worries as deadly radiation from the sun and outer space could then penetrate to the Earth's surface.

If this could be solved, then presuming we could grow gills we could live underwater. We'd need to, because within a million years the continents would have eroded to little more than sandbanks, and the sea level would rise because of all the sediment that was dumped in the ocean by the rivers. It is only subduction and mountain building, created by the same convection currents in the interior that create the Earth's magnetic field, that keep uplifting the land to compensate for erosion.

I've never really been a believer in the ''hollow earth'' theory.

But i do believe in a hollow head hypothesis.

Not this again!
http://www.newscientist.com/backpage.ns?id=mg18224506.900

Next crank theory please.

I've never really been a believer in the ''hollow earth'' theory.

But i do believe in a hollow head hypothesis.

That the earth has an iron liquid core is just bulls*** - no one knows that

Heck, we dont even really know how gravity works!

crystal sage: again I urge you to watch that video I posted. what you speak of is taken in consideration there, and the guy in the lecture presents a very workable theory that there is an inner and outer layer of the earth, but an hollow core. there are seismic anomalies that cant be explained with a firm core, but that can be explained and makes sense with a hollow one. its in regards of how the seismic waves travel around the world from one point to another.

No we dont. And watch that lecture first before speaking about seismic waves. As I said, what you believe it is just a THEORY. And a theory is not a fact until its proven, thats when its not a theory any more. And most certainly what you claim is FAR from proven. So we are back to squad: we dont know.

I have looked at the evidence. And as I said, the hollow earth model presented in the video lecture I linked to presents a theory that resolves the issues with the current accepted theory - in other words, the hollow earth theory seems MORE valid, as it answers questions unaswered by the traditional one.

Let me show you how my Hollow Planet seismic model can explain the Earth's seismology better than the existing solid Earth seismic model - and yet not one person at any university has shown the slightest interest in this.

The purpose of this page is to demonstrate a number of most amazing things about seismology to the Reader in the clearest and simplest manner possible. When I wrote my book I did delve into the many deeper and more technical aspects but I want to put that aside for now.

The purpose of this exercise is to show people visually a number of very important things which you will not find in any book on earth. (Note: This material lends itself to a TV/documentary presentation and I have tried unsuccessfully for the last 2 1/2 years to get someone to take some of my material and show it on TV because I believe it will blow people's minds). The solid Earth model is divided into three major segments (we will ignore the smaller ones as they do not affect the bigger picture). Those segments are (from the centre) : the Inner Core, the Outer Core and the Mantle.

Lesson #1: The Earth is NOT a ball of molten lava. The first question everyone asks me when they hear of the Hollow Planet idea is: "Where does lava come from then?" The (completely FALSE) impression schools have created in everyone's minds is that the Earth is this red-hot ball of lava. They then imagine that lava from volcanoes comes from the centre of the Earth. Ask any geologist or seismologist if this is true and you will discover they disagree. Standard geology and seismology texts tell a different story. Scientists know that most lava is slightly radioactive and they believe it is produced either by decaying radium (decayed uranium) or through stresses in the crust. Lava is created by heat generated within the crust of the Earth. The crust is said to be no more than 20 miles thick, although to be honest nobody has ever actually penetrated the crust so we really do not know what (if anything different) lies beneath it. Scientists will tell you that lava is a crustal phenomenon and all lava comes from no deeper than 20 miles down.

If the Earth were an "ocean of molten lava" then it would actually be subject to tidal pressures and the continents would be broken to pieces as the earth rotated. Scientists say the Earth is actually composed of solid rock for the most part. As you go deeper, the pressures are supposed to be so great that the rock actually flows from extreme pressure. (As you will see, even this may not be really true). But nowhere in modern geology or seismology will you see them saying the Earth is a ball of molten lava.

In fact, the final proof comes from seismology itself. When an earthquake occurs, seismic waves travel out in all directions throughout all the earth. There are two types of seismic waves: P and S. Based on this, scientists know that all of the earth is actually quite RIGID and composed only of rock. The only partial exception is the Outer core. Take a look the seismic diagram below. If the earth were truly molten, then seismic waves would be considerably dampened down. So the fact that seismic waves can travel through and around the earth shows that it is mostly completely rigid and solid.

In the above seismic diagram (from a text book on seismology), D=Mantle, E=Outer core, G=Inner core.

Lesson #2: Traditional Hollow Earth ideas fail the "seismology test". Let me show you why scientists simply laugh at the idea of a Hollow Planet. Keep in mind that all Hollow Earthers have, for more than a century, been saying that the Earth's crust is 800-1000 miles thick. Note in the above diagram, that seismic waves travel from the source of an earthquake (on the left) through the Earth at various angles and therefore reach the other side (this is not true of all seismic waves, but of the main ones, referred to as "P" waves). If you were to propose that a planet only has a crust of 1,000 miles or less, then this is why a scientist would laugh at you. See the image below.

In the above diagram you can see the seismic ray paths (red lines) moving away from an earthquake source. Note how the huge cavity in this "traditional" hollow earth model would block out all the "P" waves from reaching the other side of the Earth. So clearly, this type of approach does not fit the known scientific facts and so we must discard it.

Lesson #3: Is there any Hollow Earth seismic model which allows waves to go around the Earth? The obvious problem posed by the theory is that seismic waves actually reach right across to the other side of the Earth. Scientists are therefore quite confident that the P waves must have passed through the core of the Earth and this tells them that there cannot be a cavity.

When I did my feasibility study (which is what my book is), I looked at the problem from every conceivable angle to see if there was any Hollow Earth model which made seismic sense. I found only one - I repeat - only one, which has any merits. All other Hollow Earth seismic models are failures. Take a look at it below.

In the above model, I simply used the Earth's structure as scientists define it now. I replaced the Outer core with a cavity (I'll explain why later - because there is a sound reason for it). But the thing I changed was the structure of the Mantle. I wondered what would happen if density within a sphere did not increase uniformly as has been assumed. What if density actually DECREASES from a certain point onwards? You will notice all solid-earth seismology shows ray paths curving in a "U" back to the surface of the Earth. That is because density and pressure increases as you go deeper. But if, for some reason, density were to suddenly decrease, then the waves would curve in the opposite direction! I realised this, and you can see what then happens. In the middle of the Mantle, where density suddenly decreases, it causes seismic waves to travel around the cavity - right to the other side of the Earth!

You would be excused for believing that the waves might have passed through the core of the Earth when in fact nothing of the kind happened.

Lesson #4: The Mystery of the "Shadow Zone." The next problem in global seismology is explaining the mysterious "Shadow Zone". There is a lack of P waves between 103o-144o from the epicentre of a quake. Take a look at the problem as seen from a university-level text-book on seismology.

Note how the P waves strike the Outer core and scientists believe the refraction caused by this sudden change in density can explain the shadow. But notice, in this university-level text book how they are befuddled because there are still some waves which reach the shadow zone (dotted line). They are at a complete loss to explain this. Now let me explain to you how perfectly my Hollow Earth model solves this problem. Take a look at the image below.


After changing some parameters in my Hollow Planet seismic model, I have a "Shadow Zone" which matches the facts exactly! I made the cavity smaller, and I moved the "point of maximum density" (the dark circle in the Mantle) somewhat lower. Note: The Green area near the surface is the "Shadow Zone". Now look at the amazing thing that happens. We have P waves behaving as normal right up to 103o. Then suddenly there are very few of them inside the Shadow Zone and then after the Shadow Zone we are a greater and greater number of ray paths eventually converging on the other side of the Earth! This is exactly consistent with the known facts of global seismology!

Sometimes small things can make a huge difference. It is obvious from the Hollow Planet diagram why there would be a Shadow Zone. This is caused by the gradual change from "increasing density" to "decreasing density." This causes the waves to "split" - some to go down while others go up. So there has to then be an area on the surface which receives less seismic waves than normal - hence the "Shadow Zone." A really crucial point is that the "Shadow Zone" is not completely devoid of waves. In the Hollow Planet model you can see why - it makes perfect sense. In the solid earth model you can see they have to stretch their imaginations (dotted lines) in order to try to find some explanation. In their diagram they believe the Shadow is cased by sharp refraction - but clearly that explanation does not quite fit the facts.

Lesson #5: Proving, that the Outer and Inner cores - do not exist at all. You have been wondering why I removed the Outer Core altogether from my Hollow Planet seismic model. The answer is simple. There are two kinds of seismic waves - P waves - which are much like sound waves. They are pressure waves caused by a direct "push" through the matter. But then there are S waves - shear waves - which are like taking a piece of hose-pipe and moving it up and down rapidly. P waves can travel through everything except a vaccuum (although if they travelled through air they would be considerably weaker than when they travelled through rock or a liquid). S waves however, can only be transmitted through rigid materials - like rock. It has long been known to scientists that unlike P waves which can travel around the world - S waves are in fact "blocked" by something. They named this "something" the Outer core. They decided the Outer core had to be non-rigid. If the Outer core were a type of "liquid" then P waves could pass through it, but S waves could not. Hence they "invented" the Outer core. Very early on, when I became interested in the Hollow Earth idea, I realised this property of the Outer core, and I wondered if the Outer core was really a liquid, or if it was, in reality a cavity. My big problem however was figuring out how P waves behaved.

Now let me show you that the Outer core does not exist at all, while the Inner core is merely the part of the Earth in the immediate vicinity of the cavity!

Here we have a standard solid-Earth seismic model.

The waves we are interested in are those which passed throuh the core - the PKP and PKIKP waves. When one takes a look at the data showing the speed with which seismic waves travel, one discovers an interesting thing: Waves which pass through the core (those which are supposed to be going in a straight line) actually slow down! What makes this even more curious is that P waves are supposed to speed up when they pass through dense material. And there is no place on this planet which is as dense as the Inner core! So why do P waves then slow down? According to the formula for the transmission of sound/pressure waves - speed is affected by two factors: (a) Density ( Elasticity. This gives scientists a way of getting out of the problem by saying: "If the Density has increased, but the wave has slowed down, it must THEREFORE mean that the Elasticity increased."

Let us return to my Hollow Planet seismic model.


Take a look at the ray paths of the waves which reached the other side of the Earth, beyond the Shadow Zones. Look at the paths they travelled. (a) They did not travel through the core - they took a longer path around the cavity/core. ( They were the waves which travelled near the cavity - hence near the area of lowest density! Both those factors would cause the waves to take a longer time to travel to the other side of the Earth, hence, giving the appearance that they slowed down, while apparently travelling in a more-or-less straight line!! There, once more, we find a perfect match between my Hollow Planets Seismic model and what we know about global seismology. As you can see, this explanation accounts for everything observed and yet there is no need for either an Outer or Inner core.

Lesson #6: Amazing Seismic Speed Revelations - proving the Earth is homogenous. Seismologists often produce diagrams such as the one below which show the speed of seismic waves inside the Earth at various depths.


You will notice, at various depths, such as at the 5,000 Km level, the speed of waves changing very sharply - either speeding up or slowing down. Scientists look at these sharp changes in speed and then state that this is due to sharp changes in density. They use this to "prove" that the Mantle is composed of a different type of material to the Outer core and so forth. You have seen the Hollow Planets seismic model and how radically a seismic ray's path may differ from the solid Earth model. Supposing the Earth really is hollow, it would then follow that the paths of waves differ in reality from what scientific theory supposes. That being the case, scientists may suppose a certain ray speeds up or slows down when in fact it does nothing of the kind. If they knew the right path (like the rays going through the core for example), then it might turn out that such rapid speed changes never actually occur.

However, since scientists are obsessed with the need to have a model which matches the 6 trillion tons needed (according to their gravity experiments), they need to find a way of "packing lots of matter into the Earth". So they are looking for evidence of changes in density. I'm sure that when they find they have to account for certain behaviour by postulating such instantaneous increases/decreases in speed that it makes them confident they are on the right track. But the opposite may be true. It is entirely possible that if one knew the exact paths of the rays that one would find the speed of seismic waves would not vary that much.

This is a most important point. It would mean that my Hollow Planet seismic model is internally consistent. In other words, it postulates that the Earth is homogenous, and a resultant analysis of seismic wave speeds along the paths postulated should then prove that indeed the Earth is homogenous. This would be a further proof that my model is the right one and not the solid earth model.

Lesson #7: Deep Quakes may disprove the Solid Earth model. According to scientists, pressure increases with depth. According to their calculations the pressure is so great that between 70-150 Km down, all rock will begin to flow. Below 150 Km there is no known material which will not flow. Therefore, according to scientists, there can be no earthquakes with epicentres deeper than 150 Km - because it is IMPOSSIBLE!

But there are! Tens of thousands of Earthquakes have epicentres deeper than 150 Km. The histogram below shows some curious things.

It shows that earthquakes occur right up to a depth of 300 Km down. The picture is somewhat consistent with science's expectations because there are less quakes with depth (though they do not stop at 150 Km as expected). Then a most curious thing happens, they increase in number up to a depth of 700 Km where they end. Scientists try to explain these quakes by invoking various possible strange properties of matter. Although each theory advanced so far has had problems with it.

What no scientist on Earth is willing to accept is that maybe gravity does not behave the way they believe it does! That histogram may be the proof that gravity does not behave as is expected at depth. Why can't scientists look at that histogram and see it for what it might be telling us? That histogram may be "stating" quite clearly that the Earth does not have those pressures inside and that it remains relatively cool down to incredible depths? Maybe that diagram is "telling us" that gravity does not behave at depths the way we are expecting. If that is so, then everything we think we know about the mass of the Earth may be wrong.

Note, gravity is a very weak force and even a bit of static electricity could produce an attraction far in excess of anything gravity could produce - but with a fraction of the mass. If that is the case, you don't need to worry about the Earth having to have a mass of 6 trillion tons. It may weigh considerably less.

As final note, it may be that there are quakes deeper than 700 Km but they are so far away, and maybe the effects of gravity are so weak that they do not have enough force for us to detect them. Let me point out that seismologists have indeed speculated about the possible existence of "Silent Earthquakes" which are remain undetected by our equipment.

Occam's Razor & the Hollow Planets model: When in doubt, the simplest model is probably right. There is "rule" in science known as Occam's razor. Occam's Razor is a little piece of logic which states: When choosing between two or more theories it is most likely that the simplest explanation is the correct one. You have now seen my simple "sandwich" Hollow Planet model, which assumes the Earth is largely homogenous in composition, and you have seen how this simple model can match and even better the achievements of the more complex and unwieldy solid-Earth model. Does this idea of mine not satisfy Occam's Razor much more than the solid-Earth theory does?

I received an e-mail one day from someone studying at an American university. He said to me that he had never met such a closed-minded group of people as the Professors at Universities! Well, I would tend to agree with him. My book was published in July 1999. I sent copies to universities and I placed my book on the desks of university lecturers and Professors. Not one of them spent so much as 10 minutes looking at my book. After leaving my book there for weeks I eventually just gave up. Now I don't bother trying to win academics over.

My book is subtitled "A Feasibility study of possible Hollow Worlds" - and that is what it was. I wrote it because I was certain I could actually contribute something, and I truly hoped some academics or scientists would take an honest look at it. I thought if anyone would appreciate some original lateral thinking, it would be them! How wrong I was! The seismic diagram was the most important thing in it. I wanted scientists to compare my theoretical model against theirs and to match the seismic data to it. I was convinced it was superior to the complex solid earth model. It seemed to me to be a similar situation to the many concentric orbits which were used to explain the orbits of planets until it was discovered that orbits were really eliptical. Too bad there aren't any open-minded people in universities anywhere who would take a bit of their time to take a look at my Hollow Planets Seismic model and to compare its seismic predictions with those of their solid Earth models. I'll bet they would be very surprised by the results.

Just got done watching Journey To The Center Of The Earth and I must say I'm intrigued by the concept. What does everyone else think?

How has this been proven? Btw, you should learn to spell before you call other people morons.

The Earth is not hollow and this has been prooven. The hollow earth theory is only beleived by morons and the uneducated.

I don't get it...we come here to talk about unexplained mysteries and the like and you call those who think this mystery or what have you - even if its far fetched - morons and uneducated.


The book "Dead Men's Secrets" talks about people going into caves and coming upon luminesents on the walls and in rooms (different colors but most of the time its light blue or green). These same people are said to have covered up the entrances after being spooked by something inside the caves or tunnels, hearing something within such as strange voices far away or machinery, or they saw someone approaching them with batons (sillouettes of entities).

Is it possible there are civilizations or small groups of people within the earth (caves and tunnel systems) and people have mistaken them as being a "Hollow Earth"? Could these people be from a long lost previous - advanced - civilization that went underground for some reason?

I agree with you 100% El Barto!
Who really knows about these deep caves man made or not?

The Earth is not hollow and this has been prooven. The hollow earth theory is only beleived by morons and the uneducated.

Uneducated, you say? If this is how you get your point across - through the ridicule of others - it does nothing more than discredit all you say. Other members that believe in this idea are producing far more interesting insight.

There have been topics about this theory on here before Trippin!
I'm sure if you type it into the search area you will come up with a few topics on it.

Anyway IMO there is no such thing as a hollow earth just seems a bit far fetched!
But there could be massive underground cave systems natural and man made,
I figure the government has a few they have made here and there!

And in ancient writing's some culture's talk of their ancestors came from the interior,
of the planet! and that has always interested me but you really cant find much on it.

Maybe it is, maybe it isn't - both sides are speaking in the hypothetical...Unless it is actually witnessed & seen, everything that is presented here - be it scientific or metaphysic - is purely hypothetical. But both sides are entitled to post their findings without being sniped by flames - those that have presented insight in favor of the hollow earth theory are no less intelligent than those that support the current scientific model.

I don't get it...we come here to talk about unexplained mysteries and the like and you call those who think this mystery or what have you - even if its far fetched - morons and uneducated.
The book "Dead Men's Secrets" talks about people going into caves and coming upon luminesents on the walls and in rooms (different colors but most of the time its light blue or green). These same people are said to have covered up the entrances after being spooked by something inside the caves or tunnels, hearing something within such as strange voices far away or machinery, or they saw someone approaching them with batons (sillouettes of entities).

Is it possible there are civilizations or small groups of people within the earth (caves and tunnel systems) and people have mistaken them as being a "Hollow Earth"? Could these people be from a long lost previous - advanced - civilization that went underground for some reason?

subterrainian living and civilizations doesn't seem too far-fetched to me...

Really. Its amazing what people are willing to believe.

There is lots of evidence of underground living...civilizations...with functional underground transport systems...
http://underground-history.co.uk/front.php

http://www.mic-ro.com/metro/metroart.html
http://www.toronto.ca/path/index.htm

I know for a fact that most legends and myths are based on facts. And if you take this in consideration, there sure is enough material out there from all times of history that indicates a possible hollow earth - or at least huge amounts of underground cave systems and tunnels. It is a facinating subject, specially considering no one knows if the earth is hollow or not. What Redhen just posted is basically just bulls***, because no one has ever been more than a couple miles down, so we do not know what the inside of the earth is like. Everything is just theories - including hollow earth speculations. That the earth has an iron liquid core is just bulls*** - no one knows that. Heck, we dont even really know how gravity works! All we know is that it works. Here is an interesting lecture in favor of a hollow earth based on scientific research: http://video.google.com/videoplay?docid=69...;q=hollow+earth