Unusual biodiversity found in Antarctic waters

A recent Antarctic diving expedition has uncovered an extraordinary underwater world, revealing a rich biodiversity in the mesophotic zone, the area between the surface and the abysses, typically between 30 and 200 meters. This region, less explored than shallower or deeper areas, has shown an unexpected variety of marine life in one of the most extreme environments on Earth.

Divers faced extreme conditions

The expedition, conducted during the austral summer of 2025-2026 in collaboration with the CNRS, involved deep dives in waters as cold as -1 °C, with divers spending up to three hours submerged. The team collected samples and documented species such as gorgonians, "ice fish," and the impressive starfish Labidiaster annulatus, which can have up to fifty arms.

Starfish's hunting abilities noted

This starfish is a formidable predator, capable of capturing krill, amphipods, and small fish using tiny gripping structures called pedicellariae. The divers described the underwater environment as almost unreal, with vibrant colors and a diversity of species that seemed to come out of the movie Avatar.

Diverse marine life observed

Among the species observed were bright yellow forms of [SCIENTIFIC NAME], enormous nudibranches, delicate jellies, and bright orange sponges. The team also noted the presence of a tiny crustacean, possibly Antarcturus sp., which blends into the gorgonian's epifauna, becoming almost invisible.

Book documents the expedition

The expedition's findings are detailed in the book An expedition in search of marine animal forests, written by Emmanuelle Périé-Bardout and Ghislain Bardout, with photographs by Franck Gazzola and a preface by Camille Etienne. The book chronicles the months of preparation, the challenges of the Drake passage, the commitment of extreme dives up to 130 meters, and the scientific discoveries made during the expedition.

Environmental and scientific focus

It also highlights the environmental preservation issues and the human and scientific dimensions of this unique exploration, offering a comprehensive look at both the challenges and the wonders of the Antarctic underwater world.