The goverment conspiracy is quite obvious, when Europe began colonizing the world, fake reports of a continent (called australia) were believed true by goverment officials so they invested a lot of money in the "Australia Colony Project", but when it proved fake, they couldn't allow for everybody to know that the goverment was wrong or that would give an image of weakness that would cause rebellious elements to uprise, so they invested more money in creating the australian myth, expecting to refund their money by atracting investers. Then they payed dividends to all the investers to atract more and keeping the secret, but everytime the secret is bigger until eventually it will blow up. How can someone actually believe that by bringing rabbits into a continent it would render it a dessert, that is science fiction, but since Australia is science fiction once that rumor grew it was impossible to prove false without revealling the australian myth, so the rumor became part of "history"