Underwater (2020)

Kristen Stewart's an engineer on a deep-sea mining platform. The structure begins taking on water, which is bad when you're 6+ miles down in the ocean. She and a handful of other workers who couldn't reach the escape pods are forced to find another way back to the surface.

When the breach initially occurs, I thought she was having a nightmare. The movie had opened on empty hallways and cut to her, alone in front of the sink, talking about how night and day don't have any meaning down here, only awake and dreaming. And that sometimes it's hard to tell the difference. I probably spent at least two or three minutes after she started her panicked flight to a place they could seal bulkheads, expecting her to wake up.

It takes about 30 minutes before they figure out this wasn't some random undersea earthquake. Once again, humanity has fucked around and pissed off something at the bottom of the sea. No, not Namor.

The movie takes some advantage of how hostile an environment the characters are in. They really need to find a place to recharge the oxygen scrubbers in their suits, but keep coming up craps. One character has never actually used the deep-sea suits, and is understandably terrified, which means they could run through their air faster. If your helmet starts to give way, you're fucked. At one point Stewart is being dragged along towards the surface behind the captain, and you might think, good, the surface is where you need to be. But the pressure's changing too fast, so it's actually bad.

There's also the aspect of how clumsy and slow their movements are, how limited their ability is to perceive their surroundings. Inside those suits, all they really have is their eyes, and those are restricted to what their helmet lights can pick up, which isn't always very much in the muck and silt on the sea floor. Plus the helmet restricts peripheral vision. So there's a fair amount of, "what did I see?" going on, especially once they and the audience know there is something out there to see. I thought with the oxygen depletion concerns, they might do a little more with that playing into that blurred comment about the blurred line between dream and reality.