10 More Great Sci-Fi Horror Movies (No One Ever Talks About)

10. Underwater

Underwater begins with a deep-sea facility being struck by a cataclysmic earthquake. As water bursts in through every seam, marine engineer Norah (Kristen Stewart) sprints through the flooding corridors, looking for a way out. After watching this heart-pounding and magnificently choreographed sequence, viewers should be on the edge of their seat.

And that's only the first five minutes. Once the aquatic life start attacking the survivors, things become far more nerve-racking.

The entire cast is exemplary, but Kristen Stewart is the one who shines brightest. Using subtle facial expressions, she's easily able to convey a mix of strength and vulnerability. You can see the wheels turning in her head in each scene, as she attempts to find solutions to her party's mounting problems.

Even though the sea critters are dangerous, Underwater emphasises a more imposing threat that few sci-fi films acknowledge: pressure.

Since the crew are in the Mariana Trench, they must contend with the crushing weight of the ocean. If a diver's suit or a room isn't depressurised correctly, the team can implode in an instant. (Some characters learn this the hard way.)

Although science-fiction usually ignores the "science" part, acknowledging the dangers of pressure adds a gargantuan obstacle to the group, compounding the tension.