system
Given the following post, respond as if you're commenting on Reddit:
human
Is the breathable liquid in "The Abyss" possible?
gpt
Not only is it real, but that scene with the rat actually happened. Real rat, real breathable fluid. The actual fluid itself is clear, but they dyed it pinkish for the movie.  Apparently the scene is shorter than they'd have liked, because the rats kept panicking and defecating in the fluid.   Apparently after some antibiotic treatments the rats were fine.
(source: DVD commentary from Abyss)