A new ARTE documentary titled “Abysses, la face cachée des océans” details the Ifremer Bicose 3 mission to explore the deep-sea abyss [1, 2].
The film highlights the critical need to understand the planet's least-explored regions. Because abyssal ecosystems are largely unknown, studying them is essential to determine how these depths contribute to the overall environmental balance of the Earth [1, 2].
Approximately 40 researchers from the French marine institute Ifremer participated in the expedition [1]. The team operated from the research vessel “Pourquoi pas,” utilizing a specialized submersible to reach depths of roughly 3,500 meters [1, 2]. These dives allowed scientists to observe biological and geological processes that occur far beneath the reach of sunlight.
The Bicose 3 mission spanned 45 days [1]. During this period, the crew collected data and imagery of the seabed to better map the hidden face of the oceans. The documentary provides a visual record of these findings, showcasing the unique species and terrain found at extreme pressures.
According to the publication details, the documentary will remain available for viewing until Dec. 8, 2026 [1]. The project serves as both a scientific record and an educational tool to bring the mysteries of the deep ocean to a wider public audience.
Ifremer's work on this mission emphasizes the intersection of technology and marine biology. By deploying the submersible from the “Pourquoi pas,” the team could maintain a sustained presence in the abyss—a feat that requires precise engineering and logistical coordination.
“The Bicose 3 mission lasted 45 days”
The Bicose 3 mission underscores the ongoing gap in human knowledge regarding the deep ocean. By documenting ecosystems at 3,500 meters, Ifremer provides data that may be vital for climate modeling and biodiversity conservation, as the deep sea acts as a massive carbon sink and regulator for global ocean chemistry.
