@MGG I missed this whole thread after joining from the beginning.

I just read the entire thread now. Sorry I missed out on your adventure.
When I have accidentally opened a safety hole before they internally pipped at the end, they have always died. If you ever try this again I'd peel the membrane off of the beak on day 17 so it can air breathe. When I've done this if I safety opened too early they had a better chance of making it. There is always some blood I have to dry off.
Your chicks that lived are Gorgeous!