Far more enjoyable than was expected, with an unrelenting pace, decent performances and excellent moments of creature fright. Tightly claustrophobic and intense, with very few moments of breathing room, this movie starts with a literal bang and barely slows throughout the slim runtime. There’s not a lot of depth or plot, just sketches of some character development and quick exposition dumps to explain why the characters need to get from point a to point b. Main complaints are that the film's underwater segments are very muddied and it is often difficult to discern the action or details, especially with much of the action taking place from the character's perspective and behind a helmet. However, this simultaneously places the viewer in a tighter fame, claustrophobic and more relatable to the plight of the characters. Stewart is passable, the material playing to her particular strengths of long sullen stares and wooden emoting. The last act is kind of a hoot for genre fans, although nothing in this film is particularly scary, it moves fast, looks decent, and follows through for a pretty bombastic last act. A pretty good B-movie that briefly riffs of similar 80-90's fare like Deepstar six, Alien, Leviathan and The Abyss, while being unique enough. While on the whole, the premise and plot kind of break down in the face of logic this is a welcome return to solid creature features by major studios.