Attempted to play through this twice with my buddy and each time we'd end up opening the blast door which connects the circle back around to the spawn garage, but would be stuck from there. After lots of confusion, we noclipped and saw that there were three doors we were stuck on: one which leads abruptly into a dark hallway, a blast door which leads to a cargo elevator, and there is a door which appears to need a scientist which leads to a walkway through the canyon.
After looking up videos online, it's clear something's broken. There's supposed to be screen message text at the scientist door which did not show up in either of our playthroughs. Apparently a necessary door did not open (the blast door in the lobby area which leads to the cargo elevator) despite our pressing every button we can see being pressed in playthrough videos. I suspect there may be some broken triggers in this map.
This was next on our list of maps to review, but it felt unfair to review a broken map which has clear evidence of having recently been completable, likely only being broken by a typically short-sighted Sven Co-op update. Now it's on our list of maps to revisit once it isn't broken.