Spoiler
I think Cold Harbor refers to IVF, as in you freeze the eggs as part of the process. The trauma that Gemma and Mark experience is giving up after the third round of IVF failing. We see Mark disassembling the crib and it impacting them both much more than the miscarriage did. I think Gemma tried to (or did) kill herself while driving to the friend hang and thus it's the ultimate trauma for Severance to shield you from. Him forgetting to say I Love You as she left was the final straw.
I think Innie Mark is having trouble completing the file because his body remembers the trauma of going through that experience with her. The other rooms were things that Gemma was afraid of but this was something that only happened to both of them. That also explains why he is the only one who can do the file while any refiner can figure out someone hates going to the dentist or in a plane crash.
He completed Allentown quickly because it was a more specific fear/aspect of her specific personality versus something everyone feels.
I think Innie Mark is having trouble completing the file because his body remembers the trauma of going through that experience with her. The other rooms were things that Gemma was afraid of but this was something that only happened to both of them. That also explains why he is the only one who can do the file while any refiner can figure out someone hates going to the dentist or in a plane crash.
He completed Allentown quickly because it was a more specific fear/aspect of her specific personality versus something everyone feels.
