"In the Sensing With Independent Micro-Swimmers (SWIM) concept, illustrated here, dozens of small robots would descend through the icy shell of a distant moon via a cryobot – depicted at left – to the ocean below. The project has received funding from the NASA Innovative Advanced Concepts program. Credit: NASA/JPL-Caltech" (ScitechDaily, Could NASA’s Tiny Robots Discover Life on Europa?) The most impressive mission for drones or independently operating miniature submarines will be the search for life from Jupiter's moon Europa. The thing is that also two other large moons, Ganymede and Callisto could have similar oceans under their icy surfaces. And the third Galilean moon, Io has sulfur volcanoes that are also interesting geological objects. But the main object for that mission could be Europa, the icy moon with icy geysers. The probe can slip the small submarine into those geysers and maybe they can reach the ocean under that icy surface. The done can communicate with