I believe the movie was made in the late 80's or early 90's. I was a child when I saw it so I cannot remember too much about it. I do remember that some criminals kidnap a class of children and their teacher. The criminals wear animal masks (duck, pig, etc... ) throughout the movie. They take the class to a cave for some reason, but on the way there they stop at some elderly peoples house and one of the criminals shoots the old man with a shotgun and it breaks a fish tank in the house. The main thing I remember about this film was it would periodically show a human heart beating in a jar. At the end of the movie the heart in the jar stops beating. I've been trying to find this movie forever it seems so any help at all would be appreciated. Thank you

It's Fortress, the one with Rachel Ward, not Christopher Lambert.

Purukivel -And you thought you wouldn't get to answer it.

You know I was pleased when this question recycled so quickly!

How incredibly bizarre. I have been trying to remember that movie for years now thinking it was something fort. I woke up this morning and googles duck mask and kidnap and bus. I recall it being a good movie, but I must have been eight or so when it came out. Don't they strip to their undies to swim under the cave?

Good times.