Thanks, that makes sense.
Any recommendation as to whether its better to do it sidemount or backmount?
Ideally I want to keep my options open to avoid a situation where I am only competent to dive wrecks with sidemount and go to a shop where they cannot rent sidemount gear. But also don't want to be only able to do backmount dives and get to a wreck that can only be accessed with sidemount (are there any?).
Depends on the wreck. If it is turtled (upside down) or on it's keel, backmount is probably better. If it is on it's side backmount can probably still work but sidemount might be better.
In the SG, which is on it's keel, in sidemount every hatch meant I had to stop, go sideways and recover. Workable but suboptimal.
And of course sidemount off of boats is simply suboptimal.