Planet Visionaries – Ep 19: Deep-ocean discovery with Sheena Talma and Katy Croff Bell

Planet Visionaries – Ep 19: Deep-ocean discovery with Sheena Talma and Katy Croff Bell

April 28, 2026 · 30 min · Season 5 · Episode 19

About this episode

This episode features a discussion on deep-ocean exploration with marine biologist Sheena Talma and deep-sea explorer Katy Croff Bell.

In this episode of Planet Visionaries, a landmark podcast series in partnership with the Rolex Perpetual Planet Initiative, host Alex Honnold speaks with marine biologist Sheena Talma and deep-sea explorer Katy Croff Bell, who are National Geographic Explorers and members of the Rolex and National Geographic Perpetual Planet Ocean Expeditions. Together, they reveal how only 0.001 percent of the deep ocean has been visually observed even though it constitutes two-thirds of the planet. From discovering shipwrecks on the ocean floor to mapping unexplored habitats, this episode reveals why the deep ocean may be humanity’s greatest remaining frontier. For nearly a century, Rolex has supported pioneering explorers. Over time, the company has moved from championing exploration for the sake of discovery to protecting the planet. Through the Perpetual Planet Initiative, Rolex stands alongside the inspiring people who are dedicated to building a better future for all life on Earth. Credits: Personal photographs kindly provided by Sheena Talma, Katy Croff Bell. Ocean Discovery League images courtesy of Susan Poulton. Thanks also to Oceancensus. Material from the South Africa expedition and…

People in this episode

Host: Alex Honnold

Guests: Sheena Talma, Katy Croff Bell

Mentioned in this episode

Organizations: National Geographic, Rolex, Rolex Perpetual Planet Initiative, Ocean Discovery League, South African Institute for Aquatic Biodiversity, South African Polar Research Infrastructure

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