Giant Jellyfish the Size of a Bus Found in Argentina

Scientists just proved that Argentina's deep ocean is far more alive than anyone imagined.

A research expedition traveling from Buenos Aires to Tierra del Fuego discovered extraordinary marine life thriving in waters previously thought to be relatively sparse. The star of the show? A giant phantom jellyfish that can grow as large as a school bus.

The rare Stygiomedusa gigantea was spotted at 250 meters deep, its bell measuring up to three feet across and its four ribbon-like arms stretching an incredible 33 feet long. Unlike typical jellyfish, it has no stinging tentacles and instead uses those massive arms like a net to trap plankton and small fish.

Scientists from the University of Buenos Aires and Argentina's National Scientific and Technical Research Council led the December to January expedition aboard the research vessel Falkor. They explored the entire continental shelf using underwater cameras and remote vehicles.

"We didn't expect to see this level of biodiversity in the deep waters off Argentina," said María Emilia Bravo, the expedition's chief scientist. "We opened a window into our country's marine life, only to discover that there is still so much more left to find."

The team also documented the world's largest known Bathelia candida coral reef. Covering roughly the size of Vatican City, this cold-water stony coral creates a bustling neighborhood for fish, crustaceans, and octopuses.

The Ripple Effect

This discovery changes how scientists understand life in the southwestern Atlantic. The Bathelia reefs were found even farther south than their previously known range, suggesting these vibrant ecosystems extend across far more ocean floor than expected.

Cold-water coral reefs like these are recognized as Vulnerable Marine Ecosystems because they shelter so many other species. Finding one this large means thousands of creatures have a thriving home in waters once considered relatively barren.

The Schmidt Ocean Institute, which provided the research vessel, has now supported three expeditions in Argentine waters. Each one reveals more hidden abundance.

"With each expedition to the deep sea, we discover that the ocean is teeming with life, perhaps even more so than land, since it contains 98% of this planet's living space," said Jyotika Virmani, the institute's executive director.

The expedition's live broadcasts on social media brought the wonders of the deep ocean directly to thousands of viewers. Last year's expedition in the same region went viral when the team discovered a "big-butt starfish" that captured hearts worldwide.

The ocean still holds countless secrets worth protecting and celebrating.