You have to cut a hole from the inside in the area where that happend and work from the inside out. There is probably something loose that caused that from the inside. That most likely is a meeting point of the inner and outter hull. I had a sceptre that was cracking like that in the same area just wasn't to a point where yours is right now. Something is moving around in that area that caused that, these hulls area not known for cracking unless there is a problem inside there. Dont just fix it from the outside cause it will happen again.
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