The gravitational pull of Saturn cause the moon to flex, which causes heating up. This is believed to be what causes the liquid water ocean under the icy crust to remain liquid. This has implications for the possibility of finding life on other similar small worlds. As with our own planet, we know that life can exist without sunlight deep at the bottom of the ocean near hydrothermal vents, that provide energy and nutrients for life to thrive. There are several moons like Enceladus that are potential locations for sending robotic spacecraft in search of life.