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A hidden, interconnected ecosystem beneath Antarctica’s sea-ice, rich in life, shaped by extreme conditions, and revealed through science.
The undersea world of Antarctica is a hidden, interconnected ecosystem shaped by extreme conditions and revealed through scientific exploration. Beneath the sea-ice lies a surprisingly rich and vibrant environment, where diverse life thrives despite the cold, darkness, and isolation. From drifting jellyfish in the water column to dense communities of anemones and invertebrates on the seafloor, this ecosystem is far more complex than it appears from above.
Life here is highly specialised, with species uniquely adapted to survive in freezing temperatures and low-light conditions. Many organisms, such as giant glass sponges, grow slowly and can live for centuries, forming important habitat structures that support other species. These sponge “forests” and benthic communities demonstrate that the seafloor is not barren, but a highly structured and dynamic environment.
At the foundation of this ecosystem is the sea-ice itself, where ice algae form the base of the food web. This supports a chain of life that connects the ice, water column, and seabed into a continuous system. Scientific divers play a crucial role in uncovering and documenting this world, using specialised techniques to explore beneath the ice.
Together, these elements present Antarctica’s undersea realm as a place of quiet clarity, resilience, and remarkable biodiversity, an unseen world that is both fragile and extraordinary.
Date of issue: 4 November 2026