Hundreds of sharks filmed feeding 30 miles off the coast of Louisiana . The footage was captured by a camera attached to an unmanned underwater vehicle (UUV). Experts say the predators were migrating north and following shoals of fish .
Hundreds of sharks filmed feeding 30 miles off the coast of Louisiana . Dramatic footage taken by a worker on an oil platform 70ft above the sea . Experts say the predators were migrating north and following shoals of fish .