This movie was sort of bad acting, and that’s mostly why I liked it so much. I think the whole movie was about finding this sunken boat or ship or something out in the ocean. In the beginning the grandpa wears gear to go deep sea diving but the rope snaps or something and he drowns and dies. I think the rest of the movie is about a teenager boy (maybe the grandson) and a teenage girl who tries to figure out the mystery. I can’t remember any actors in it, but I know that it’s about finding a boat or ship and solving the mystery.