They're tiny, blobby, butt-shaped, and glow in the dark. What the heck are they? Scientists are still figuring them out.

This story appears in the March 2015 issue of National Geographic magazine ... leaving just the blue. By 700 feet deep, the ocean has become a kind of perpetual twilight, and by 2,000 feet ...

The sighting “highlights the importance of modern, cost-effective technologies to survey the deep sea and locate these lost ...

On October 6, however, the space reopened as National Geographic Encounter ... with shallow-water daylight episodes bookending nighttime events in the deep and open ocean. The first gallery is an ...