 Given the light gravity and resulting lower pressure in the ice mantle or inner ocean, colonizing the rocky core's outer surface might give colonists the largest number of mineral and volatile resources as well as insulating them from cold.Surface habitats or domes are another possibility, as background radiation levels are likely to be low.Colonists of such bodies could also build rotating habitats or live in dug-out spaces and light them with fusion reactors for thousands to millions of years before moving on.