Underwater Sequence unstable

I was very interested until the underwater sequence. I am running a late 2015 Mac desktop. The graphics requirements are met and there is no reason why I shouldn’t be able to play this game flawlessly. Yet for some unknown reason, the graphics are choppy and very difficult to navigate during the fourth stage in the game. Will be deleting this and asking for my money back.

SOneal1263 about SOMA 2015