A self-described "armchair astronaut" claims to have identified a human (or alien) base on Mars. David Martines noticed a mysterious rectangular structure that appears to be on the Red Planet's surface while trolling the planetary surface using Google Mars, a map program created from compiled satellite images of … Google Mars base maps available for Opportunity's future traverse. Google Earth Live – proving that a lot of people think Google Earth has live imagery. Secret Mars Base Found in Google Maps/Mars – Google’s April Fools joke for 2017.