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Giant phantom jellyfish spotted deep in Pacific

Laura Baisas

created: Jan. 6, 2026, 9:15 p.m. | updated: Jan. 13, 2026, 6:21 p.m.

Like a scene out of a Jules Verne novel, scientists from Schmidt Ocean Institute recently encountered a giant phantom jelly (Stygiomedusa gigantea). The enormous deep-sea jellyfish was spotted about 830 feet below the surface of the Pacific Ocean by a Remotely Operated Vehicle (ROV) exploring the Colorado-Rawson submarine canyon wall off the coast of Argentina. ROV pilots filmed this giant phantom jelly, or Stygiomedusa gigantea, at 253 meters during an ROV descent to explore the Colorado-Rawson submarine canyon wall. Giant phantom jellyfish have four long oral arms that do not sting the way the tentacles on other jellyfish do. MBARI’s ROV Tiburon previously spotted a fish swimming alongside of the giant phantom jelly during an expedition to the Gulf of California.

6 days, 21 hours ago: Popular Science