Many months ago I theorized a world that was a cross between Titan and Europa. It was a world that had two surfaces and two environments. The top environment was like Titan’s surface, with a methane cycle. This world had an icy crust with water volcanoes.

Below this icy surface is the bottom environment, which resembles what is under Europa’s ice. Here there is a water ocean coving a rocky surface with silica volcanoes.

I wonder if there could be a mantel of liquid water under Titan’s surface?

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My thoughts on Europa. I would love to see a submarine probe exploring it ocean, but I don’t see the technology to get under the ice being available any time soon.

Titan is a dynamic world with real weather. The methane cycle would be fascinating to study. The methane rivers, lakes and seas would offer great eye candy.