Truth is as Truth is, the Atlantians had access to these underground networks.

If you think an advanced race of aliens can't possibly exist on earth, perhaps you should take a plane trip to new york, then IMMEDIATELY take the fastest known craft on earth to a remote area of Africa, and take a gander at the little black fellas running around in underwear, living in straw huts.

How many 1000's of years in advancement do you think those 2 places are apart? 5000... 10000?

And it's on the same planet.