While some noted the sharks themselves were occasionally convincing, others lambasted the "shoddy and cheap" CGI and poor green-screen work.

Cassidy (Scout Taylor-Compton), an oceanographer who witnessed her father's death by a shark as a child, goes on a treasure-hunting dive in Madagascar to face her fears. The Twist: Her group is hijacked by modern-day pirates searching for a sunken shipment of drugs. The Conflict:

Because survival thrillers rely heavily on shadows and darkness to build suspense, watching in a dimly lit room prevents screen glare from ruining the atmosphere.