Five siblings and their best friend take a trip to Australia where they meet their most dangerous predator, Bruce. Bruce is the largest shark in the world. He is over 50 feet long and 20 feet wide. To the humans, he has been classified as a Megalodon, which is supposed to be an extinct shark. Desperate to dive down and find out more about the large and famous shark, they take a boat out to sea only to find their worst enemy waiting to greet them. Will they ever come up for air?