I dunno, 2 metres sounds pretty impressive to me. That's just over 1 MJ (Michael Jordan). Remotely, in vacuum, in stony electrostically evil regolith which migh

I dunno, 2 metres sounds pretty impressive to me. That's just over 1 MJ (Michael Jordan). Remotely, in vacuum, in stony electrostically evil regolith which might also be big solid bits and no takebacksies on the drilling site. Apollo 17 was three metres deep, but they had a meatbag-in-a-bag to feed in drill segments and keep things under control. Which has its own tricky technicalities to keep the meat fresh and moving, to be sure. But it does simplify the other mechanisms.