u/Content-Marsupial596

Birds have nested in my unused chimney, I think it’s a crow/rook. The nest is all the way down, I can hear the birds chirping. Will the babies be able to fly away when they’re ready?
I can access the area via a hatch.
I don’t want to disturb them but I’m worried they may die if they can’t make it out.
I’ve only just moved in and will seal off the chimney once the birds have moved on.
Any advice would be very gratefully received.