Pipping but no zipping after 30+ hours.

My loudest cheeper (the first one that pipped) is zipping! (or is that UNzipping?) Halfway around the shell. No further progress from the rest, but this one is determined.

LATER - He popped his shell open! You were right, it went fast once he got motivated. He's lying down in a section of shell right now, but still cheeping!
 
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I figured I should leave the chick in the incubator until some of its siblings hatch too. I don't know if it can dry out in that humid environment, but it won't get cold. How long should I leave the incubator on "lockdown"?
 
UPDATE - The Good, the Bad, and the Unknown

As of this morning, I have 1 strong healthy chick who hatched perfectly yesterday.

The three other pippers died in the shell overnight without making any further progress. I thought one had zipped yesterday but it turned out to be a line of goo around the egg from the first chick's hatching.

"Eggtopsy" revealed two of the three chicks were extremely large - bigger than the one that hatched! One was in the proper position (it was the second cheeper). The other two, who had pipped closer to the pointed end of their eggs, were totally upside down and their heads had not turned into position for zipping. I'm surprised they managed to pip. All three had been "rocking and rolling" a lot yesterday. One of the "breech" ones had a burst yolk but its head was straight down on top of its belly -- maybe it broke the yolk while trying to pip? All three pippers had pipped externally and had air, so did not drown.

Lockdown humidity was 70 to 75 percent (I had purchased a hygrometer and put it beside the eggs-- had been warned not to trust the indicator built into the bator)

Despite the humidity, could the membranes have dried out? Or could the chicks have been simply too big to move around?

I candled the remaining four eggs left in the incubator that hadn't pipped. Three had not developed. One has developed and is moving, but appears to need a few more days. It would be nice if that one actually made it so the first chick won't be lonely. Meanwhile, I'm looking for some day-old chicks so I can put one or two in with the survivor.

I'm naming the healthy chick "Harry Peeper - The Chick Who Lived"!
 

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