Read at english.elpais.com
The underground oceans of moons such as Europa, Ganymede, Enceladus, and Titan have long been considered as potential habitats for extraterrestrial life due to their conditions for supporting microbial life. Now, a study published in Nature suggests that Mimas, another one of Saturn's moons, may also have an underground sea. The discovery was made through an analysis of Mimas' movements around Saturn, which revealed the presence of a liquid ocean under a layer of ice. The sea is estimated to be 20-30 kilometers thick, and simulations suggest it formed between 25 and two million years ago. This finding expands the possibilities of where life could exist within our Solar System.
The most interesting thing about this work is that it shows that in addition to Europa, there are other moons in the Solar System where there are also these habitable spaces