http://interestingengineering.com/na...titans-oceans/Saturn’s moon, Titan, is more planet-like than many other planets in our own solar system. There exists clouds and an atmosphere strikingly similar to Earth. Even with these similarities, there are a few differences, like the oceans of liquid methane. You really don’t want to go swimming in that. Despite the non-habitable nature of Titan, NASA is building a robotic submarine to explore the methane oceans to look for possible signs of life. Humans will likely never be able to visit the moon of Saturn, but that doesn’t mean that some form of other organism couldn’t possibly survive there.