Well fantastic. Another ridiculous movie that will only perpetuate an unfounded fear of sharks, and give fuel to those that see no problem with the killing of millions of sharks on a regular basis.
Sharks are not dangerous and very, very few people are injured or killed by sharks in the water. I personally have been in the water with reef sharks, lemons, and even a bull shark with no concern for my well being. If you treat them with respect and do not harass or chum, your likelihood of having an negative encounter is minuscule.
Please do not let movies like this perpetuate fear. Sharks are beautiful and graceful animals.