Mind the gaps
I think it's kind of a moot point. There have been clever designs for deep-drilling ice probes for Europa, but I think any eventual probe will have much better luck finding either a vent or some kind of consistent "upwelling" area where water from far below has oozed out onto the surface.
If there are traces of life or complex molecules, they will be in this stuff. The probe's only chore will be to bore down through the new ice far enough to get at material that hasn't been cooked by radiation.