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Lock down is day 18 with chicken eggs, you stop turning them on that day, sometimes slightly tiping the fat end up, so the chick can get into position to hatch. Here's an article with tons of good info. https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/

The bubble is the air sack, the chick pecks into it before it hatches, it's its first breath of air