There have always been ideas about a hollow Earth. When they became discredited some people said, "Well, the moon is hollow." They claimed that it rang like a bell for two hours when the boys landed on it. Now it's "Mars is hollow too."There isn't any evidence whatsoever and it goes against accepted theories in geology, physics, math etc. that are based on EVIDENCE.PS. John Lear's evidence is indicative of some kind of disorder. Whilst he claims there are buildings there, he also asserts that 9/11 was a US conspiracy to increase the heroin trade and use the money to finance a secret war against aliens! I mean come on? Use Occam and go for the obvious instead of piling on layers of speculative invention.