These awe-inspiring pictures reveal what icebergs look like from below. The images were taken in the freezing crystal-clear waters of Greenland by underwater lensman Tobias Friedrich. He dived up ...

In an expedition unlike any other, National Geographic photographer Laurent Ballesta took a cold, harsh plunge below the sea ice in the deepest dive ever under ... makes the images you see here ...

For years, it has been declining in health, and now it is under greater threat than ever ... he took 150,000 macro images of coral, compiling it into a time-lapse that reveals just how dynamic ...