Anyone remembers how this ends?

Huh, I don't remember almost any of that. Not much of an impactful ending, I guess. Thanks for clearing this up for me.

The Army come in to check on them on day 10 because of lost comms and only 5 ppl have survived the massive bat attack.

Not trying to be snarky but I am pretty sure the army showed up because the athlete managed to open the door hatch at the top of the elevator shaft, which triggered an alarm back at some monitoring center. They all did not want to wait the ten day period, when they would have been checked up on by the military after the military did not receive any messages from the mole, given the increased attacks. Anyway, the near catatonic survivors are escorted from the bunker by the army, all of them (who were left) much worse for wear.