At first glance, Jupiter's moon Europa or Saturn's moons Titan and Enceladus don't appear to be the most promising sources of life in our solar system with their thick icy shells. But beneath the ice are oceans of potential that NASA and oceanographic partners are interested in exploring. Learn what they hope to find in the deep, and the science fiction-style missions being developed to discover it, including the Europa Clipper and Dragonfly missions.