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" ... Scientific evidence shows that sharks spend considerable time in the upper water levels of the ocean, driven by both physical and ecological needs such as preferred temperature, oxygen concentration, light levels, timing (to forage successfully), and avoiding predation. But surface waters don’t always have what these large epipelagic fishes need, and oftentimes they need to dive deeper. Shark movements can be classified as horizontal movements and vertical ones, with the latter being more commonly referred to as diving. These dives are characterized by rapid changes in temperature, light level, hydrostatic pressure, and in many cases, low oxygen conditions as they get deeper. Like many pelagic sharks, shortfin makos and blue sharks into the inky darkness. ... "