There could be ecosystems like this deep underground on Mars, Europa, Ganymede, Titan, Ceres, or many other places in the solar system. I would not be at all su

There could be ecosystems like this deep underground on Mars, Europa, Ganymede, Titan, Ceres, or many other places in the solar system. I would not be at all surprised if we find such a place by the end of the 21st century. I hope to live to see it.