A team of oceanographers discovers that the Carcharodon megalodon—a giant shark-like creature believed to have been extinct for millions of years—is alive and well and swimming dangerously close to the southern Chinese coast. This big-budget monster movie is idiotic but inoffensive; the characters are paper-thin and the story doesn’t make much sense, but the upbeat portrayal of a close-knit, hard-working professional team is engaging and (if you squint hard enough) vaguely Hawksian. Director Jon Turteltaub (National Treasure) strikes an agreeable tone, avoiding both unnecessary heaviness and self-aware camp. Playing a devil-may-care naval captain, Jason Statham leads a serviceable ensemble cast that includes Rainn Wilson, Li Bingbing, and Jessica McNamee.