Total B movie, with actors and a set piece taken out of a PG version of Texas chain saw please massacre me movie, but an amazingly original and neat concept. The basic premise is on the summary - time moves slower in a cave than outside. Absolutely impossible. But what if it did? The movies presents a whole bunch of paradoxes woven into a simple storyline with no side plot distractions. And no matter how many time travel paradox variations you may have read, there is always an interesting twist and this movie really makes you ponder some new ones. The script is amateurish, the notion of a fountain of youth needless, but with the theme of the story and ending so intriguing - I had to actually watch the film twice. But I am quite confident they will ruin it all with a money milking sequel :-)