IF the images are real, there is absolutely no plausible explanation that wouldn't shatter preexisting world views.
The most likely thing I can think it might be is a secret military base, or a secret "last-resort-if-earth-gets-destroyed" project. But that still doesn't make any sense because how did they build it, who got sent up there to work on it?
The theory that martians could have built it and traveled to earth before a huge war seems like the least likely explanation to me due to a simple logical inconsistency: human culture clearly evolved on earth from cave men to modern industrial society. If martians came to earth to save themselves they wouldn't have destroyed all records of their technology and cultural heritage (or maybe they did?)
In the end, I have to believe it's faked because there just isn't an explanation that remotely makes any sense...
Somebody ridiculed me when I mentioned this conjecture about a year ago. Then I found the following videos last week that tell how any skeptics can look up the Google Mars images themselves. I don't know about you, but these images are extremely convincing to me. Like the narrator, I don't see how anyone can arrive at any other reasonable conclusion. What do you think? There exists much additional evidence, too, but I'm finding out that coincidence theorists don't even bother to watch my posted videos before repeating their existing opinion, so maybe it's pointless to post more evidence right away.
If humans didn't build these structures, then who (or what) did? Or if the pictures are faked, who in NASA would go to such extensive trouble to mislead the public, and why, and why hasn't NASA explained the pictures?
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LOOK! Huge Underground Base Entrances Found On Mars In Google Earth
https://www.youtube.com/watch?v=tgM7uBFdzVU
DAHBOO77
Published on Dec 5, 2015
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Why Is There A Base On Google Mars? What Really Happened On the Red Planet?
https://www.youtube.com/watch?v=fJOx9VlP0JE
DAHBOO77
Published on Jul 12, 2017