The Marietas Islands were originally formed many thousands of years ago by volcanic activity. Being completely uninhabited, the Mexican government started using the islands as target practice prior to the First World War. These controlled bombings have formed numerous caves and other unique rock formations on the Marietas Islands. It is believed that the Hidden Beach was created as a result of these bombings together with natural erosion of the rocks surrounding it.
After a massive international outcry, started by scientist Jacques Cousteau in the late 1960s, the government eventually decided to label the islands a national park. Today the islands are protected from human activity and only a few tour operators are allowed to take tourists there after obtaining necessary permits.