I'd say the film is at least 5 years old, probably not more than 12. It's Spanish language but I don't know which country it's from. I don't remember much about it except that I liked it. A couple of people, maybe 2 guys & 2 girls, end up on a ship at sea, maybe they had boat trouble and were rescued by the ship, the guys already on the ship have something to hide, the couples see or hear something that makes them realize they're in trouble and the killings begin. There's a part where the bad guys have one or two people in a cage over the water and are going to drop it in the drink if the other person doesn't come out from hiding. The cage part is on the front cover of the release I saw and it's been in the dump bin at Walmart. Can anybody name the film? Did you find it as entertaining as my hazy recollections are leading me to believe it was?