Blacktip sharks flock to South Florida’s warm coastal waters every winter, but watch this before you cross Florida off your vacation list.

In Open Water, a new movie about a scuba-diving couple that is mistakenly abandoned in the middle of the ocean, the school of menacing sharks is real.

"We thought we would have to swim with two or three sharks," said Daniel Travis, who plays one half of the stranded couple. "But when we showed up for filming there were about 45 or 50 of them."

The movie, which opens in limited release on August 6, is unlikely to change the stereotype of sharks as vicious killers. But it's a more realistic portrayal of sharks than the usual Hollywood fare.

"It was important to work with real sharks, to get the way their tails flap around like big rats in the water as opposed

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