The idea of the main character getting is some kind of loop hole, be it purgatory, her going crazy, the bermuda triangle or whatever is pretty interesting. For me especially the greek interpretation.

But holy shit was it boring. As soon as you pick up on the idea of the loop there's no reason to keep watching. You already know it'll end on her being stuck in there forever. There's nothing else there to keep it interesting or scary. Most incidents are clear to you one minute before they happen and all you see is things repeating themselves, but it doesn't add anything to the story and then you have to watch scenes multiple times.

The dialogue had some foreshadowing and meaning to it, but the characters were so cliche and at some times just dumb. (ex. watching the storm come and not immediately heading back). The acting was mediocre too. All the main character does is look confused/scared the whole movie, which leads me to my next point.

Being a horror movie it didn't scare me either. All she does is "act" like she's in a horror movie because there's literally nothing to be afraid of in the first 30 min and as soon as you get the idea nothing else happens or gets under your skin. The characters don't matter either, they're just there for the plot (ex the girl who drowns is there so you think it's her blood on the ship, which obviously it isn't) The cliched music cues and sounds were just annoying.

So yeah. The idea was ok, maybe great. I can't really say because the rest was horrible.