I cant help but imagine how fucking terrifying those 46 years alone must have been for Rocky. The pure terror of never knowing what actually killed every singe person on your crew except for you and you alone for nearly 50 fucking (Earth) years must have been agonizing.
Rocky is not a scientist but hes likely familiar with the basic principles of an experiment and he likely knew that since he has literally no idea what killed everyone else, the only way to ensure his own survival was to add as few variables to the mix and change as little as possible.
Considering the fact that he's, you know, alive by the time Ryland shows up, I would guess that Rocky never left that workshop unless absolutely strictly necessary, among other things that stayed the same for, again, almost half a century. Just in case that was the thing keeping him alive. Even if it meant living in monotony for an indeterminate amount of time.
Its a damn miracle hes at all mentally stable honestly.
