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If you use something hard and blunt and tap until you get breaks in the top of the egg, you can carefully go into north pole and not damage anything if there's someone still going inside. try to make as small a hole as possible right at the top so you won't interfere with their own progress should someone be in there alive. Use a flashlight to see if there's movement to the membrane, and use a wet q-tip to dampen it to see the veining, or lack thereof, if you can't be sure about the movement. Good luck! Generally I see them solid dark when they've pipped internally and can't make the external break.