Researchers exploring the Cayman Trough have identified the Beebe Vent Field, a series of hydrothermal vents located 4,968 metres deep.
A remotely operated vehicle (ROV) discovered the site, which features mineral-rich waters reaching temperatures of 401 degrees Celsius.
The extreme pressure at this depth prevents the superheated water from boiling. These vents occur where tectonic plates separate, allowing seawater to interact with subterranean magma. As the water rises, it carries dissolved gases and minerals back into the ocean, creating the distinct chimney structures observed by the research team.
The site contains “black smokers,” which are characterized by high concentrations of iron sulphides. These chimneys release fluids that appear dark as they exit the seafloor. In contrast, “white smokers” typically transport silica and barite and operate at lower temperatures, the London Natural History Museum (NHM) reported.
While the fluids exiting the vents are hot, the surrounding environment cools rapidly as the minerals mix with ambient seawater.
“While these fluids are hot, they tend to cool very quickly as they mix with seawater,” NHM researcher Maggie Georgieva said. “The vent might be very hot, but when you move away from it a little, you can have a temperature of 20°C or so, which is quite nice for lots of animals.”
Despite the extreme conditions, the Beebe Vent Field supports colonies of shrimp, anemones, squat lobsters, and zoarcid fish, also known as eelpouts. Because sunlight cannot reach these depths, the ecosystem relies on chemosynthesis. Bacteria convert vent chemicals into food, providing the foundation for the local food chain.
The shrimp found at the site lack normal eyes. Instead, they have a specialized light-sensing organ on their backs, which the University of Southampton noted may help them move through the faint glow of deep-sea vents.
How do organisms survive near 400°C water?
They do not live inside the vent fluids themselves. Life thrives in the immediate vicinity where the water temperature drops to manageable levels, such as 20°C, after mixing with the surrounding ocean.
Why are the chimneys at the Beebe Vent Field black?
The dark color is caused by the high concentration of iron sulphides carried in the superheated fluid.
These minerals precipitate as the hot liquid hits the cold seawater, forming tall, chimney-like structures.
What is the primary energy source for these creatures?
Since photosynthesis is impossible without sunlight, these organisms rely on chemosynthesis. Bacteria convert chemicals from the vent into food to create energy, which then supports the rest of the deep-sea animal community.