The oxygen levels in ocean water is depleting, which has resulted in hypoxia in various parts of the Pacific Ocean, Atlantic Ocean and the Indian Ocean. Even though scientists have come across oxygen deficient pockets in oceans in the past, the rate at which these pockets are spreading has left these scientists alarmed. Studies in marine biology have revealed that the amount of oxygen concentration in ocean water in certain parts of the world has gone down by 34 percent over the last five decades.