Continuation of the science fiction book “Secrets of the Earth”. Life on other planets is not pampering. On the “Big” planet, where the same people live as in the neighboring galaxy on the planets “Mars” and life that arose on “Earth,” life proceeded differently. On the “Big” planet there were no wars, no weapons. They suffered from frequent meteorite bombardments, causing them to deplete mineral resources and other vital sources of livelihood for the people. Scientific and technological progress at the Bolshoi was the most advanced in the galaxy. The production of robots and spacecraft surprised everyone. To replenish mineral reserves, people send robots to Earth. A lot of time passed, and there were no results from Earth. In difficult conditions, scientific research into the study of a living organism found deep in the bowels of the Bolshaya gives fantastic results of speed capabilities. The portal “Medusa” appears, which brings together the people of planet Earth and the Big One.