Kristen Stewart once again invades multiplexes in the deep-sea thriller Underwater. It’s not a completely horrible movie, but here are some reasons why you’d be better off staying home and streaming 47 Meters Down if you’re in the mood for subsurface terror.

1. It stars Kristen Stewart and TJ Miller.

When we saw Charlie’s Angels earlier this year, my friend and I had a debate as to who was worse in it – Stewart or costar Naomi Scott. Until earlier today, I would have argued that it’s basically impossible to cast anyone in a movie who will manage to underperform Stewart. But Underwater has finally proven me wrong. Because somehow, despite a long history of horrible behavior, including last year’s arrest for a fake bomb threat on an Amtrak train, Miller continues to get work. However, as with literally every other role he’s had, all he does is play himself: a loud, obnoxious man making jokes at the worst possible times.

It’s fine to have some comic relief in a tense movie, but it still needs to fit, which Miller’s role in this film most certainly does not. And also, it might not have been quite so bad if Miller didn’t comprise fully 1/7 of the entire cast of the movie.

2. It can’t decide what kind of movie it wants to be.

47 Meters Down is a straight-up shark horror movie, and it works in large part because it never tries to be anything else. Unfortunately, Underwater’s story is a lot murkier.

The basic setup of the movie is that a company had decided to construct a drilling platform at the bottom of the Mariana Trench, a full 7 miles below the surface, for, well, reasons. As the movie opens, Stewart is brushing her teeth and waxing philosophical (in one of two poorly written voiceovers) when suddenly the entire complex starts to implode.

What follows for a lot of the rest of the movie’s brief 95-minute run time is a formulaic but tense underwater disaster film. Stewart randomly connects with a few other survivors; there are two token dudes whose jobs are never clearly stated (and whom IMDb at this point doesn’t even list character names for, even though I’m sort-of maybe certain they might have had names). There’s the love interest for one of the dudes, played by Jessica Henwick, who tries to do something with a nothing role. There’s Miller, who also never has his role on the rig explained, and there’s the grizzled captain, who probably has a dark past, but the movie never slows long enough to more than hint at it.

Had director William Eubank, whose prior directing credit was The Signal, a 2014 movie I don’t remember but recorded as having given 4 out of 5 stars to, and writer Brian Duffield (who wrote Insurgent) chosen to follow the disaster movie trope, then Underwater probably would have worked fairly well. But unfortunately, they went a different way and thought it’d be neat if instead, the movie was roughly half formulaic disaster film and half formulaic monster movie. And in so doing, they ensured that the movie as a whole didn’t work at all.

3. Like 47 Meters Down, there are some genuinely tense moments.

You can kind of assume we know from early on who will make it and who won’t, and for the most part, you won’t be disappointed. But even when you’re fairly sure they probably aren’t going to kill the woman who is on all of the posters within the first 15 minutes of the film, there’s a particularly great scene early on where Stewart, Miller, and one of the nameless characters have to crawl through an entirely too-tight space to escape the rig that is slowly collapsing around them. I’ll admit that I cringed a bit in that scene.

Unfortunately, though, while the movie tries really hard to maintain that level of tension, it never quite makes it back, eventually resorting to a long series of jump scares to propel things forward.

4. Still, it does hint at some interesting world-building.

47 Meters Down pretty much takes place in our world, so there’s no need to establish what else might be going on. Yet while Underwater claims to take place on Earth, with 2020 technology, here there be monsters, so it clearly isn’t entirely our world. About two-thirds of the way through the movie (don’t worry, no spoilers), there’s a sequence where the above-mentioned backstory for the captain almost starts to get explored, and honestly, I really want that movie. But given that Underwater is being dumped by the studio in January, and that is has to try to succeed against holiday leftover films like that one from that one sci-fi franchise and Oscar-bait movies finally making it to theaters where the rest of us can see them, it’s unlikely they’ll be making this a franchise anytime soon.

But then again, everyone died in 47 Meters Down (sorry, I meant I wasn’t going to spoil Underwater. Two-year-old movies are totally past the spoiler statute of limitations) and that still got a sequel, so who knows?

5. It does have a few nice twists.

That point in the final scene when… just kidding. I’m really not going to spoil this movie. I will just say, though, that in the end, Underwater does manage to subvert a few expectations.

6. They’re both short.

In this era of three-and-a-half-hour not-cinema movies of old white guys trying to hang on to their relevance and three-hour final entries to long-running superhero franchises, it’s always nice to be able to run to the theater in the middle of the day and still be back in time to pick up the kids from school. At 1 hour, 32 minutes, Underwater is just barely longer than the 1 hour, 29 minute 47 Meters Down.

That makes Underwater short enough not to have to endure its downsides for too long. I certainly wouldn’t recommend that anyone rush out to see Underwater, but it’s the kind of show that you can have on while you cook dinner in a month or so once it’s out of theaters and on Netflix.