I saw a slasher movie about 10 years ago when I was a kid that has stuck with me. The movie involved a one room school house out in the country somewhere. The kids and teacher get kidnapped by a group of guys wearing animal masks. The kids then escape and run away from the killers, but several kids and killers get killed throughout the movie. I remember there is a scene where the kids are in a cave and must swim underwater to escape from the killers. If anyone can remember the name of this movie I would really appreciate the help, having been wanting to see this movie again ever since. I think it might have been made sometime in the 70s or 80s.