The youll know what the next question is...why?
off topic but.. I heard of a team of GUE dives that was exploring a wreck that im very familiar with recently not sure if its GUE or this particular group but they dont use lines for penetrations. One ccr diver got lost inside the wreck and spent 3 hours trying to find his way out - he shot an smb out of a small port hole and a buddy noticed he was overdue and went to see what the problem was ( yes he was solo after being seperated) - the diver was on his bailout and fortunately the second diver was able to smash a window and pass some more gas to him while others went in to rescus him...
and heres the punch line...
he still thinks you shouldnt have to use a line, that progressive penetration is the only safe way
Whilst I may have issues with some aspects of GUE. This really doesn't sound like GUE. They are fanatical about the use of lines, coming from the cave diving environment.
GUE have many positives, the focus on excellent buoyancy control, and good diving skills, etc. Progressive penetration, would be a no, no in a GUE team.