Comment Re:Heat issues (Score 2) 262
There has been billions of dollars of research into drill bits over the twenty years since the Kola project stopped, drilling deep holes in rock under awkward conditions being more than somewhat useful for the oil industry - the mud-motors that Kola is described as pioneering are now reasonably routine. But whilst 400F is something that people deal with now, 600F is still quite a problem.
The drilling fluids probably will be fairly horrible, and simply getting electronics to work at those temperatures is hard (NASA have done some work in silicon-carbide-substrate semiconductors, since it would be fantastic to be able to run a robot on the surface of Venus, but I don't think they've met with much success).