This covers more information on the Hollow Earth theory by an individual named Jeff Contreras who has dedicated a good part of his life on this and many other subjects.
In my humble opinion he hits the nail on the head in this series of talks when giving his and others take on the theory of Pangea VS The expanding earth.

I'm not sure that most of you know that at present we have no explanation to why planets are in a phase of over unity....they are producing more energy out then what goes into them from the sun. (I've always heard that there is no such thing as overunity...from the free energy debunkers)
Jupiter, Saturn, Uranus, Neptune and on and on just to name a few, are emitting energies that the scientific community by their antiquated theories can not answer this question.

There is more then meets the eyes and for the most part they will not budge off of the old theories, my belief is that if they did they would have to rewrite what gravity is and most of the theories that pertain to a lot of what we are being taught in the books.

I my lifetime I have seen many, many things having to be rewritten, I was taught in school to believe in ways and theories that do not stand as the truth today. When they where rewritten it was in a hush hush manner.

Skepticism is a must in the world that we live in, without it the truth will never be told.
Just because someone says it is so does not make it such, research and discover what is being held in the other hand of the magician, don't divert your eyes onto the hand he tells you to look at.

Added July 17, 2007:

 One more point of interest that came to mind.
 Today I was thinking about what Jeff had said about the earth being smaller in size and then expanding to the size that we live on today to explain how the continents spread out from each other.

 If what he stated is true then that could explain the massive size of dinosaurs...something that has puzzled scientists since their discovery .. That question being why were all the creatures of days gone by so large in size ... even the vegetation was huge.

 Could it be that when the earth's size was smaller the effects of gravity were less?
 Think about that for a minute ... if the earth's mass was less then the effects of gravity would have been less, as the earth expanded the gravitational pull would have increased due to the increased size of the mass.

 Having less gravitational pull on the surface of the earth would have allowed whatever creatures that lived on the earth to grow larger in size without the stress associated with a stronger gravity such as what we have today.
Maybe the expansion of the earth was quicker then Jeff thinks crushing these massive creatures with this newer stronger gravitation pull, these huge creatures would not be able to sustain their massive weight and only the smaller creatures would have been able to survive.

 Just some food for thought.

There 4 I am - Hollow Earth 1, Part 1 of 4

There 4 I am - Hollow Earth 1, Part 2of 4

There 4 I am - Hollow Earth 1, Part 3 of 4

There 4 I am - Hollow Earth 1, Part 4 of 4

There 4 I am - Hollow Earth 3, Part 1 of 4

There 4 I am - Hollow Earth 3, Part 2 of 4

There 4 I am - Hollow Earth 3, Part 3 of 4

There 4 I am - Hollow Earth 3, Part 4 of 4

There are many other videos by this individual and many more others, Please do a search on google video for more on the subject.

Sorscoder