The third book was so bad. I loved the first and actually enjoyed the second (it was the first time i heard about “the dark forest” theory), but the third just annoyed me.
From the moment the MC failed her task because of her motherly instincts or some bs like that to the last 100+ pages that were just the author masturbating over his ideas of how ultra high-tech-civilizations could develop, there was nothing that made sense or was really compelling about it.
You missed nothing stopping midway through book 3.
I think the oxygen is down to less than a day now, starting from a best case scenario of 96h when contact was lost.