The Asylum's Empire Of The (Cheap CGI) Sharks is scheduled to air, in the States, on SyFy tomorrow (Saturday) evening. It's a prequel to last year's Planet Of The Sharks.
"On a future earth where 98% of the surface is underwater, a warlord rules with an army of sharks. When the daughter of a mysterious shark caller is captured by the warlord, her friends team up with a band of outlaws to set her free. But for their rescue mission to succeed, the captive shark caller must marshal a supernatural ability and join her friends in battle, if they are to defeat the warlord and free her people from the Empire of the Sharks."