The south-polar ice-jets on Enceladus are apparently movable, as in, they wiggle around as they work.
This rather puts paid to the idea of them being simply boiling reservoirs of water (ice) as claimed by NASA (“possible evidence of Yellowstone-like geysers fed by reservoirs of liquid water,” they say), & points out their more dynamic nature.
This nature is kind of difficult to explain without introducing a powerful, mobile set of forces to be driving it.
The linked article claims that this set of features are electric in nature, which suits both the power & mobility quite well, but doesn’t suit conventional astrophysicists very much at all. It will be interesting to see how this sorts itself out.