“Biologists have discovered a thriving deep-sea coral reef off the coast of Argentina. The scientists are still measuring the extent of the reef, but it may turn out to be one of the largest cold-water reefs in the world,” reports The Doomslayer.
Mongabay adds:
Biologist Erik Cordes has spent much of his career studying cold-water reefs — coral systems typically found in chilly, dark waters far below the ocean’s surface. But his latest project took him by surprise when he and a group of colleagues discovered what might be one of the world’s largest deep-sea, cold-water reefs.
Over the course of two expeditions aboard the research ship R/V Falkor (too) — first in July 2025, and then in December 2025–January 2026 — Cordes and a team of scientists explored a previously undocumented cold-water coral reef system along a 900-kilometer (560-mile) stretch of Argentina’s territorial waters, about 1,000 meters (3,300 feet) below the surface. Globally, cold-water reefs can be found in depths as shallow as 50 m (164 ft) and as deep as 4,000 m (13,100 ft).
Just one of the coral mounds — underwater hills made up of coral skeletons topped by living coral that take thousands or even millions of years to form — stretched out over an area of 0.4 square kilometers (0.15 square miles), nearly the size of Vatican City. The expeditions, mounted by the U.S.-based Schmidt Ocean Institute, identified many more of these mounds across the 900 km that it mapped, leading the researchers to believe the corals could be part of one of the most extensive cold-water reefs in the world.
The world’s coral reefs are more plentiful than previously thought. “High-resolution satellite maps show that coral reefs cover an area of ocean larger than New Mexico,” reported Bloomberg News. That’s about twice the size of some prior estimates.
A very healthy coral reef is nestled among offshore oil platforms.
Fish species are rebounding off the coast of California due to their young finding a sanctuary in abandoned oil rigs.
“According to a 2014 study…the rigs were some of the most “productive” ocean habitats in the world, a term that refers to biomass – or number of fish and other creatures and how much space they take up – per unit area. The research showed the rigs to be about 27 times more productive than the natural rocky reefs in California….Subsequent studies showed that some species of rockfish produce 10 to 100 times more eggs and larvae at these platforms than at natural reefs.”
A study found that corals recover faster on artificial structures than natural ones.
