movie where woman is split in half while surfing

Researchers on the undersea lab Aquatica have genetically altered the brains of captive sharks to develop a cure for Alzheimer's disease. But there's an unexpected side effect: the sharks got smarter, faster, and more dangerous. After a big storm damages their remote research facility, they must fight for their lives.

To fulfill a friend’s dying wish, a young sailor Kenji takes on the task of delivering an heirloom to his friend’s daughter, Harumi, who has been adopted by another family. When he arrives, Kenji soon discovers that Harumi and her adopted family are the targets of an evil gang boss. In an attempt to help them, he decides to take matters into his own hands.