"Water volcanoes"
A Europa orbiter, AND a lander. Preferably a rover. Go for it!
I think everyone's working too hard at trying to get through the ice.
if...IF...there's a liquid ocean under there, stresses and other forces are bound to shove some of that through cracks to the surface someplace or other. Find these places by orbital observation, and send a probe down to check it out. If there's signs of life or the chemical leavings of it, it should be frozen in the flow. The probe just has to dig far enough into the ice to get at stuff any surface radiation wouldn't ruin.