User blog comment:Diego Brando/Phantom Blood (Doubt about coffin)/@comment-65.191.16.19-20140702215823

Maybe right before or right after the explosion Dio  fused his head onto JoJo's body. And then once Erina was saved the coffin just floated and then sank. Dio searched for the coffin and brought it back to the wreckage and decided the time wasn't right for him so he slept there until someone found him and woke him up?