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

Pigbutt worms were named by the remotely operated vehicle pilots who found the strange blobs. During long hours exploring the deep sea ... like the back end of a pig," Osborn said.

As he shined his light on the water, large, worm-like sea creatures appeared to be swimming around, the video shows. At first, a single animal appears in the video. Then, more and more come into ...