Deep sea researchers investigating the depths of the Mariana Trench made a remarkable discovery four days ago. The glowing red and yellow jellyfish with apparent tentacles. Researchers said this type of jellyfish has  never been seen before.

The researchers, who were traveling aboard the National Oceanic and Atmospheric Administration (NOAA) research vessel Okeanos Explorer, captured the above video of the glowing jellyfish.

Marine biologists say that it is likely a type of jellyfish called a “hydromedusa” belonging to the genus Crossota. While many jellyfish species go through a stationary polyp phase before growing into gooey, drifting blobs, Crossota jellies spend their whole lives floating freely through the ocean, George Dvorsky reports for Gizmodo.

via The Smithsonian