Overreacted a bit today with some mild panic. Things like to go wrong right before hatch, but I don't think any damage was done.
Someone in my family thought it'd be a great idea to close the vent (completely close it, not even just halfway) on the incubator so the eggs could get more humidity. They had plenty already (a little over 70%).
I noticed and wasn't sure how long they had been like that and was pretty upset since the silkies are just a mere 2 days from hatching and everything had been going perfectly up until this point.
I ended up candling a couple just to ease my anxiety a bit, no internal or external pips yet (wouldn't have even opened if I saw any external pips). But the chicks are still alive and moving, I think trying to get into hatching position.
I don't know what exactly would happen with less airflow, but I know it's not good. So in my mind, it jumped to "someone just killed my 19 fully-developed chicks". I'm really glad that's not the case. Vent probably wasn't even closed for an hour.
Definitely not as bad as when the power went out last year (also during lockdown), and even then we still got a decent hatch.