In the open ocean, a manta ray's path can seem deliberate, until, without warning, it slips beneath the surface and vanishes into the blue. Hours or days later, it reappears far from where it began.

New research has found that oceanic manta rays, the largest ray species, can dive to extreme depths. International researchers led by Murdoch University, Australia, tagged the rays in Peru, Indonesia, ...

Oceanic manta rays dive to record depths of 1,250 meters (4,100 feet), according to a first-of-its-kind study to examine in detail the extreme deep-diving behavior of these rays. Researchers tracked ...