- 'Incredible' creatures -Until the middle of the 19th century, scientists believed that life was impossible beyond a few hundred metres. From the abyssal plains to the cavernous trenches plunging deeper than Everest is high, aquatic existence continues in spectacular diversity. "When people think of the deep sea they often think of the seafloor," said Karen Osborn of the Smithsonian's Natural History Museum. "I don't think we're going to find a megalodon," said Osborn, referring to the giant ancestor of the shark. Nadine Le Bris said species that "already live at the limits in terms of oxygen or temperature", are already "disturbed".
