Comment: Hollow Earth?

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Hollow Earth?

I guess it is those giant unicorns that live in the center of the earth that create its magnetic field.

Seriously people - the maps were probably made using crude sonar.

"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain