Tony, truly sad. It is a shame something like this happened, but as stated, everyone is safe. How it passed proof and nothing happened is a good one.

I firmly believe that a bulge is bad news, and yes they can be repaired, but who knows if the metal went back to the same area. In a dent, either from bumping it against something sharp, or however else they happen, the metal isn't streched like it is with a bulge.
I think the only way to tell if it is safe, would be an x-ray

David