2124 year. With the advent of new telescopes, an unknown activity was discovered beneath the surface of Europe. Groups of the best scientists and astronauts set off to find out what the sixth satellite of Jupiter hides. The mission initially seemed a failure, scientists hoped to find very simple microorganisms, but what was their surprise when, under a thick layer of ice, a whole world opened before them, full of unprecedented flora and fauna. An underwater base was built for research, but the constant tectonic activity of silicate rocks did not allow the installation of modules at great depths. After some time, scientists determined that faults in the depths of the satellite cause unknown activity, and it was decided to go on an expedition to a suspicious source, on the approach to the fault our researchers saw that gigantic giants and small creatures, as if in fear, were hurrying to leave the anomalous zone. What will our heroes discover and will this journey become their point of no return? ...