Also, I think this may be the first Trek story to reference masturbation, when Fletcher is needing a good shag, Hernandez mentions something like "going into your room and being your own best friend" or such like that. I was wondering how four humans in isolation would deal with their relationships. Libido is certainly a powerful drive in the human experience, and it was good to see that addressed in this situation.
I sort of smiled at the masturbation/"shag" references myself. Not something one reads in just any Trek novel.
But I do have to say, after reading from the lower half of page 180 through the upper half of page 185, my first thought was, "If Ingmar Bergman made a Trek movie, it would be like this."