Fantastic watch, would watch again, and do recommend, especially for horror fans.
This is a movie that took from "Alien" and "Jaws" significantly in regards to seeing the danger.
Admittedly, this movie does have some ramp up time where it spends a lot of time establishing the setting in the 1st act, but it (mostly) comes into play as somewhat important as the 2nd and 3rd as the story progresses.
Once it starts getting creepy it increases exponentially throughout the movie, and with such a great concept and even execution.
This is probably my favorite low budget horror movie, and while the movie looks a little grainy in parts, and it's a cast of (mostly) unknowns, you can tell exactly where the majority of their budge went, and it was worth it.
If you have ever liked a creepy horror movie, then give this a go.