No, Sarah. The city that you mention that will be found beneath Mt.Shasta is in fact a colony city founded by the ancient race we call The lemurians. As far as stretching from the western most pacific to where Mt Shasta is located would in deed be quite a stretch of land mass at that. The lemurians did colonize and influence much of the pacific cultures as well as the Americas. As did the Atlanteans with the Americas as well.
In the most recent years, evidence of Lemuria has been discovered off the coast of Japan and Okinawa Island. However, this recent discovery called "Yoniguni" is still quite argued over regarding origin. But over time, scientists will realize this with newer discoveries to come.
Regarding more about the yet discovered city beneath Mt. Shasta, I have heard it reported that this city was siezed from the Lemurians by another ancient race called the "Dracs". A reptillian race that alledgedly evolved here as well and now inhabits the "inner Earth". Sounds more like the plot of a sci-fi/fantasy novel, but hey . . .truth has been discovered to be stranger than fiction. Who knows! More than interestin never-the-less.