From National Geographic:

Saturn's largest moon, Titan, is perhaps best know for its unique, hazy atmosphere and lakes of liquid methane.

But a new look at Titan's insides reveals even more oddities: Beneath the brittle crust of ice lies a layer of slush. Deeper still is an underground ocean over a solid core of rock and ice.

http://news.nationalgeographic.com/news/2010/03/100311-saturn-moon-titan-core-water-ocean/

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