Champion freedivers Guillaume Nery and Julie Gautier created this amazing film showing "breath hold" diving. Though claims have been made that the entire film was made on one breath hold by both diver and videographer, that is a fiction and the film is an artistic creation. That said, they really do dive this deep without equipment. It's just that this film was not made with just one take.
Location? Dean's Blue Hole is one of those places that just drops off into darkness. It is the deepest known seawater blue hole and plunges 202 meters (663 ft) down on Long Island, Bahamas. Though they can be created in a few different ways, think sink hole in water.
Not long (one breath), this short film is worth the watch. LINK