12 Alternative Horror Movie Endings You Didn't See

This Kristen Stewart fully submerged Alien homage got a tough time of it critically, yet there are enough simple thrills and good performances to keep you breathing until you make it to the surface.

In the year 2050, Norah (Stewart) is an engineer on a deep sea drilling operation rig which from the very opening is doomed to destruction. What they don't know is that Cthulhu, straight from the pages of a Lovecraft horror, and all his imaginatively realised, gelatinous minions are pulling the station apart and devouring the survivors.

A desperate, if repetitive, escape attempt ensues; Norah and chums have to climb down a thing and swim through another thing to eventually get to the thing that'll take them back to the surface. Norah takes one for the team and stays behind to detonate the reactor core, taking both her and Godzilla's slimier big brother to a watery grave.

In the alternative ending, however, she restores power to the final escape pod, using her locket chain to fix the circuit, in a nice call back to some personal tragedy (the loss of her partner) her character experiences off screen.

The theatrical ending is downbeat and sacrificial, the alternative ending has a more resounding message of hope and survival, so it's down to personal taste really. The end credits had implied a potential sequel, though Underwater 2: Cthulhu Takes Manhattan has yet to materialise...