The only thing holding the rust together is the undercoating. The car has been closed up and in storage for the past year or so and i think the last time i was in it, it was raining. I ripped out the carpet and found this, it was still wet and all. there is no rust in the surrounding area leading to it. the only thing i can really thing of is the body seam where the rocker meets the floor, that joint might have been leaking and water was drawing itself in.