Four sharks, at various levels, swimming through the deep black waters above the ocean floor. Photo-captured in the wide blue beam of light from the surface. RESEARCH #DdO:) MOST POPULAR RE-PINS - http://www.pinterest.com/DianaDeeOsborne/underwater-glory/ - UNDERWATER GLORY. Marine Science studies vary on how deep sharks don't go. Scientists don't know why sharks don't go deep like cod. Great whites can swim 56 km/h / 35 mph & dive down to ~900 m / 3,000 feet.