An international team of scientists has identified a previously unknown deep-sea coral reef in the Pacific, revealing a rich ecosystem far below the ocean surface. The discovery was made with advanced submersibles during an expedition to unexplored waters, according to Reuters.

Researchers say the reef is thriving in extreme conditions and supports a wide range of marine life. The finding adds to growing evidence that deep-ocean habitats can be more complex and resilient than once assumed, even as surface waters continue to warm.

The team believes the ecosystem could help scientists better understand how coral communities adapt to changing temperatures and environmental stress. It may also guide future efforts to protect vulnerable marine habitats as climate pressure increases across the world’s oceans.

While much of the deep Pacific remains unmapped, this discovery underscores how much of the planet’s marine biodiversity is still unknown. Scientists say further study will be needed to determine how widespread similar ecosystems may be and how best to preserve them.