Where Does the Water Come From?

Where does the water come from?
This seems like a silly question. The South Pole station rests on top of miles of ice. Just melt the ice right?
This is what was done up until the 70's, but due to the altitude and the extreme cold, it a time-consuming and fuel-consuming process where much of the heat is lost to the atmosphere.
Then some dude named "Rodwell" came up with a brilliant idea.
Drill down into the ice with hot water and pump up the melted ice.
This process creates a huge underground lake of melted water which is constantly circulating. Hot water goes down, melted ice water comes back up. Brilliant!
At a certain depth, it's no longer cost-effective to pump water out of the hole, so you just make a new hole.
The old well then becomes a depository for all the station's waste water. (Before I arrived here, I was really hoping that the waste water was somehow shipped out and processed in a proper facility, but this isn't the case. It would be far too expensive).
The exact GPS coordinates are recorded in case the waste water deposits need to be relocated for treatment or disposal in the future (yeah, right), and life goes on as usual (or as usual as it can be in the highest, driest, most desolate, most pristine (more-or-less) continent in the world).
So the next time you think of the South Pole, think of the pure-whiteness, the vast, desolate nothingness of snow-desert... and giant lakes of frozen poop-water hidden beneath the surface.