What do you do when they don't pip?

[City Chicken]

I have fifteen downstairs that haven't even pipped one day 22. Two were born on day 20 and 10 pipped on day 21.... But these 15.. Not a pip or a peep.
What would you do?
I threw out ten last time on day 24-25. So bummed. They were all properly developing on day 14. Anyway to salvage this? Should I bother trying something? Or just wait until they are all toast? Are they toast anyway?

 

[sumi]

They may still be viable. Have a look here: https://www.backyardchickens.com/a/step-by-step-guide-to-assisted-hatching

 

[City Chicken]

Ok will look... This is a diff thread that what I've seen before.