So basically this mad scientist kidnaps a group of people and tells them that he has different levels of sharks that become more aggressive as they go through more levels. In order to advance one person must die. Theres maybe around 10 people with 9 levels to leave a winner. I clearly remember the ending as these 2 people who had a connection and were meant to be the couple of the movie were on a boat in the middle of the ocean. The last standing dude loved the girl so much that he wanted her to survive so he jumped off the boat and let the shark kill him.