I had read in an earlier article that their approved methodology was to pull back the instant they detected liquid water---which, due to the pressure of the ice

I had read in an earlier article that their approved methodology was to pull back the instant they detected liquid water---which, due to the pressure of the ice sheet, would flow out of the hole---and withdraw the drill and go away for the winter; then come back in November and drill out cores from the now-really-well-frozen water that would have risen from the hole. Basically, using the lake's water to plug their borehole and protect the lake. So I'm not sure what this kerosene and freon business is about.