Troutmaster
Contributor
"... the moment you remove the option to make a direct ascent to the surface."
Yup.
OP: you're describing the scuba equivalent of "Dude, hold my beer... and watch this!"
A phrase, after which nothing good can come.
Some of my fondest memories are just after "dude, hold my beer." And alot of them have scars associated with them, so I think you have a good point.
Not to beat a dead horse, but you need to have some training in overhead environment diving. Given the layout you described if you had a silt out and wandered down the hallway by mistake then we have to get a mod to move this thread to the accidents forum.
If you get the training and can do this dive safely, it sounds really cool.
Dive safe.