A powerful new episode of Planet Visionaries, a landmark podcast series created in partnership with the Rolex Perpetual Planet Initiative and National Geographic, dives deep beneath the ocean’s surface to uncover an invisible force shaping life on Earth. Episode 18, titled “The Hidden Ocean,” features marine biologist Dr. Andrew Thurber of UC Santa Barbara’s Marine Science Institute and microbial oceanographer Dr. Allison Fong, alongside host and professional climber Alex Honnold.
The conversation centers on a world rarely seen but critically important: the vast communities of microscopic organisms that inhabit Earth’s oceans. These microbes, though invisible to the naked eye, play an outsized role in regulating the planet’s climate and sustaining marine ecosystems.
Dr. Thurber, a National Geographic Explorer and key member of the Rolex and National Geographic Perpetual Planet Ocean Expeditions, has dedicated his research to understanding how deep-sea microbes influence global carbon and methane cycles. In the episode, he explains how these organisms act as gatekeepers, helping to stabilize greenhouse gas levels and maintain balance in Earth’s climate systems. His work highlights the delicate interplay between ocean chemistry and microbial life in some of the planet’s most extreme environments.
Joining him is Dr. Allison Fong, also a National Geographic Explorer and key member of the Rolex and National Geographic Perpetual Planet Ocean Expeditions, whose research focuses on polar regions. Fong studies how microbial communities in icy waters support fragile ecosystems that are increasingly threatened by climate change. She emphasizes that these tiny organisms form the foundation of food webs in some of the harshest environments on Earth, making their survival essential for broader ecological stability.
Together, Thurber and Fong paint a compelling picture of an interconnected ocean system where even the smallest life forms have global consequences. Their insights underscore a central message of the episode: protecting the ocean requires understanding not just its visible inhabitants, but also the hidden microbial networks that sustain it.
For UC Santa Barbara’s Marine Science Institute, Thurber’s feature in Planet Visionaries reflects its leadership in advancing ocean science at a global scale. His work exemplifies how cutting-edge research can illuminate hidden systems that are essential to life on Earth.
The episode also reflects the broader mission of the Rolex Perpetual Planet Initiative and National Geographic. For nearly a century, Rolex has supported explorers pushing the boundaries of discovery. In recent years, that mission has evolved toward environmental stewardship—supporting scientists and innovators working to protect the planet’s future. Through collaborations with National Geographic, the initiative amplifies the voices of researchers like Thurber and Fong, whose work is reshaping how we understand Earth’s most complex systems.
Planet Visionaries – Episode 18: The Hidden Ocean offers listeners a compelling look into the unseen forces that govern life beneath the waves—a reminder that the smallest organisms can have the greatest impact on the health of our planet.