It’s a UFO ― an underwater fishy object.

A jellyfish that looks amazingly like a flying saucer was recently filmed by a team of marine biologists from the U.S. National Oceanic and Atmospheric Administration.

This “UFO” isn’t really unidentified. Its scientific name is rhopalonematid trachymedusa, a type of deep-sea jellyfish. It was filmed last week by scientists aboard the Okeanos Explorer, a NOAA ocean research ship now exploring the National Marine Sanctuary of American Samoa.

Watching the jellyfish move around the deep ocean can be a hypnotic experience.

The researchers who filmed the bizarre creature said the jellyfish has two sets of tentacles, one set facing upward and the other downward. The reason for this is unknown.

The sanctuary covers 13,581 square miles of nearshore coral reef and offshore open ocean across the Samoan archipelago in the South Pacific. The mission continues through April.