Yeah, they say in their launch video for Project Obsidian (https://www.youtube.com/watch?v=xmrna_r_b3A https://www.youtube.com/watch?v=xmrna_r_b3A) that they'll

Yeah, they say in their launch video for Project Obsidian (https://www.youtube.com/watch?v=xmrna_r_b3A https://www.youtube.com/watch?v=xmrna_r_b3A) that they'll drill the first 3km using conventional rotary drilling and mmWave beyond that. I'd be curious if anyone (perhaps the parent) knows why – my assumption is that it's more expensive and/or not as reliable to drill higher up with mmWave, not least because the ground might be uneven materials, etc., and then it becomes something predictable and harder to rotary drill lower down, incl. as you would spend more time doing things like replacing bits low down and sending things up and down?