You might get a nibbler and open up the hole to sound metal - then -
Many high end manufacturers now glue their cars together - I saw several such a Lotus and Ferrari pn How It's Made.
They do test strips and check them for hold - If the bond is bad, the car is repaired or destroyed.
You might just glue a patch on.
Several years ago, our hazmat team had a drill at the Duco company - they mentioned that the first automotive use of glue in production cars was a Ford model and their glue was used on its front bumper.
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