This ventilated feature gives a lot of room to fantasy discussions...
If my engyneer is fatigued I would like to notice it by his face and slower movements and reactions... (extremely fatigued, fall asleep at his station...)
I would like to see extreme situations into the sub, like water or fire in a compartment, and the people running to fix it, with a certain chance of success... even people dyeing in the process if serious enought... (some random factors would be interesting).
Curious to see what it happens by calling "battlestations"
Some crew members with weak nerves that with a certain chance, will pessimistically yell when under water bombs attack even when silent running is an order, compromising the position... lol