If the hole is bigger it means it is able to get air. 72hrs is a long time can you hear oit peeping does it sound strong? if it's made a bigger hole then I'd say it's still working and to leave it alone you want it to hatch on it's own if at all possible. Can you see the membrane with out opening the bator you don't want the humidity to drop at all right now. we don't want shrink wrapped gosling. can you post a good pic of what your seeing?When i said starting to unzip i must have been wrong, its just made a bigger hole 12 hrs later so i should wait upto 72hrs for the unzipping to occur??