That is anything but a tiny hole.
Can you see a bill through the hole? There is no internal and no external pip, so you may have jumped the gun. However, your picture window shows that humidity is definitely not where it needs to be. Do you have wet (not dripping) sponges in your incubator to help keep humidity up? Gently swab the membrane with warm water so that it looks transparent, then a very thin film of vegetable oil on the membrane only after the blood vessels on top have receded. It will serve the same purpose as Bacitracin but has no antibiotic properties. Too much or too early will prevent oxygen transfer and kill the duckling. If it is malpositioned and pips through the side, then you can moisten the membrane to ease in hatching.
It's really hard to put all your hopes on a single egg.
Can you see a bill through the hole? There is no internal and no external pip, so you may have jumped the gun. However, your picture window shows that humidity is definitely not where it needs to be. Do you have wet (not dripping) sponges in your incubator to help keep humidity up? Gently swab the membrane with warm water so that it looks transparent, then a very thin film of vegetable oil on the membrane only after the blood vessels on top have receded. It will serve the same purpose as Bacitracin but has no antibiotic properties. Too much or too early will prevent oxygen transfer and kill the duckling. If it is malpositioned and pips through the side, then you can moisten the membrane to ease in hatching.
It's really hard to put all your hopes on a single egg.