Mélanie Laurent stars in the claustrophobic new Netflix film “Oxygen” as a woman who awakens to find she’s stuck in a confined container with her air running out. And she has no idea where — or who — she is.

You might be able to guess where this story is going and why we see so many lab rats in the trailer. But are any of the animals harmed in the film?

SPOILERS

Laurent’s character, who eventually realizes her name is Liz and that she’s a scientist, tries to determine what led to her current situation. Among her memories: Working with lab rats and running them in mazes.

In flashes, we see rats put in separate, labeled containers. And we see them being placed in different conditions, although it’s hard to know exactly what’s going on. Are they also running out of oxygen? Are they dying? Are they dead?

If you have a phobia about rats running over you, heads up: At a few points, Liz, who isn’t sure what’s real and what isn’t, thinks that her capsule is full of rats. And she apologizes to them for the experiments, saying, “It wasn’t me.”

If you want more answers, director Alexandra Aja explains the ending in this Inverse article.

And watch the trailer here: