house to move into. i mean, we were excited about them coming home. >> reporter: but there was some unfinished business. one last adventure david had long talked about, but never got around to. he had heard of a church partially submerged in falcon lake on the mexican side in an abandoned village called old guerrero. perfect for a couple who loved their jet skis and loved adventure. >> i'm just like, okay. let's go see it. >> reporter: had they asked local law enforcement would have warned them about pirates on the lake. had they asked, captain stacy holland would have told them not to go. >> we don't recommend going into mexico on the side of the lake, but it's perfectly well within your rights, but we just want you to be aware that that threat is out there, and it's very real, and you should take it seriously. >> reporter: it was a thursday