Wrong Jordan.
This was a compressive failure, we know this because the break is inwards.
Not an outward explosion like you describe.
There is a risk associated with "egg Shell" methods of construction such as Tortured ply, this is what happens when they fail.
If the hole were due to the pressure difference, it would be an inward break would it not.? Plausable explanation i think? I would never have expected a hole such as that, cracks and splits sure but that hole is interesting. I cannot work out how you would place those two surfaces under sufficient compressive load to