Blue Water, White Death (1971)
Four years before Jaws, directors Peter Gimbel and James Lipscomb sailed from Africa to Australia in search of great white sharks. They found one. Footage of the film crew swimming among oceanic white-tips (busy shredding a whale carcass) is so raw that you won't mind that the great white doesn't show up until the end of the film. When it arrives, lunging hungrily at the cameras, you'll rethink your next sea plunge. The recently released DVD captures the carnage in all its sharp-toothed glory.