Enceladus, Saturn's moon, has under its icy surface a large ocean, and what is believed to be its characteristics have been reproduced in a laboratory. Data indicate that certain microorganisms could tolerate, better than was thought, the conditions of that place.
Microbes living in hydrothermal vents on Earth feel perfectly well in the ice ocean of Saturn Encelad's satellite, which scientists have come to conclude by putting real microbes in the equivalent of this solution.