I do not believe that to be the case.

Maybe not- and I am sure I don't have the precise depth. But I am directly quoting Jim Briscoe's expressed specific concern that- in the long ago days of BG- he was worried that- even if he began drilling at HM- he would not have had the understanding nor persistence to continue to the proper depth and would quit too soon. And he cited depths of the magnitude I mentioned- based on the ZTEM studies.