My thoughts are it was pretty much a bomb. It was based on true events, but the description of the movie says that "three lighthouse keepers vanished after finding a mysterious trunk". I realize it is changed to some degree, but why say in the movie description that they mysteriously disappear when that's not what happened at all in the movie? They all died but one. That's a bit different than "mysteriously disappearing".
I want to know... what happened to the poor dog, Jed? :( :(