

A small ship went to the Mariana trench to film a mockumentary. No one survived, only short video clips of what appears to be mermaids killing everyone is left behind. Now 7 years later a cruise ship filled with ambitious scientists go back to find these sirens.
A good build up leading to a lot of bloody action but the ending fell flat with unanswered questions.These creatures are what nightmares are made of, they are many and they are vicious