Elephant seal
Elephant seals dive to 1550 metres beneath the ocean's surface: the deepest recorded dive of an Elephant seal is  . The average length of their dives is around 20 min for females and 60 min (1 hour) for males, as they search for their favorite food. Their diet includes skates, rays, squid, octopus, eels, penguin (Southerns only), and small sharks. Their stomachs also often contain gastroliths (stomach stones).