This short documentary on sharks doesn't feature any human attacks or evidence of same, except in anecdote. The worst things that happen are that the diver Rodney Fox nearly dies twice, because of a dropped flipper, and a shark getting tangled in his oxygen cord. Fox tests shark repellent on blue sharks, and later submerges in a glass tube to see if sight is what makes sharks attack, as opposed to scent or electrical fields emitted by living things. Interesting things to see are 2 Great White sharks nearly colliding as evidence of their poor close sight range, and the underwater kelp forests at Catalina Channel. There is a somewhat unnecessary sea-lion POV swim, slow-motion, and self-conscious camera-work and sound effects - distorted lenses, the filming camera being screen-cleaned, and underwater camera clicks.