At 830 feet below the waves off the Argentinian coast, deep-sea explorers caught a glimpse of a rare, giant phantom jellyfish drifting silently through the water. Eerie yet fascinating footage shows ...

Diver and underwater videographer John Roney shared mesmerizing footage from his last dive — a close-up of the world's largest jellyfish, the lion's mane jellyfish. As Gizmodo reported, the footage ...