Shark Attack 3: Megalodon

In a distant past, the massive Megalodon, a 20-tonne predator with a 10-foot wide bite, dominated the oceans, but eventually became extinct. However, when a marine biologist uncovers a massive shark tooth off Mexico's coast, she realizes her worst nightmare: the ruthless creature has survived and is feeding on everything in its path. As it attacks workers during an underwater cable maintenance, they must hunt and destroy the monstrous beast before it's too late.