Uploaded June 2025 | Updated September 2026, 2 weeks ago
From the Radiolab podcast: What happens when the ocean’s most feared predator comes under attack?
This is episode four of Swimming with Shadows: A Radiolab Week of Sharks.
Alison Kock was working at a car wash in Cape Town when she made a discovery that completely changed the course of her life. Inside a customer’s trunk, she found photographs of white sharks flying so high above the water they looked like airplanes. She followed those photographs to False Bay, “the Great White Capital of the World.” These sharks, in this place, are the apex of apex predators. Or they were. Until they mysteriously began to disappear.
Special thanks to Kathryn Ayres.
EPISODE CREDITS:
Reported by Rachael Cusick
Produced by Simon Adler and Maria Paz Gutiérrez
With help from Rebecca Laks
Original music from Simon Adler and Maria Paz Gutiérrez
Sound design and mixing help from Jeremy Bloom
Fact-checking by Diane A. Kelly
And edited by Pat Walters
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Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org.
Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.
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Photo illustration by Jared Bartman
Video by W. Harry Fortuna
From the Radiolab podcast: What happens when the ocean’s most feared predator comes under attack?
This is episode four of Swimming with Shadows: A Radiolab Week of Sharks.
Alison Kock was working at a car wash in Cape Town when she made a discovery that completely changed the course of her life. Inside a customer’s trunk, she found photographs of white sharks flying so high above the water they looked like airplanes. She followed those photographs to False Bay, “the Great White Capital of the World.” These sharks, in this place, are the apex of apex predators. Or they were. Until they mysteriously began to disappear.
Special thanks to Kathryn Ayres.
EPISODE CREDITS:
Reported by Rachael Cusick
Produced by Simon Adler and Maria Paz Gutiérrez
With help from Rebecca Laks
Original music from Simon Adler and Maria Paz Gutiérrez
Sound design and mixing help from Jeremy Bloom
Fact-checking by Diane A. Kelly
And edited by Pat Walters
Sign up for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Sign up (radiolab.org/newsletter)!
Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (members.radiolab.org/) today.
Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org.
Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.
🎧 Subscribe to Radiolab wherever you listen to podcasts: lnk.to/radiolab!youtube
🔎 Subscribe to Radiolab on YouTube: bit.ly/3I9KI53
🖋 Subscribe to Radiolab’s Newsletter: radiolab.org/newsletter
🌱 Check out Radiolab's Starter Kit Playlist: bit.ly/3sX8f4P
👍 Like this video ✏️ and leave us a comment!
Follow Radiolab:
Instagram — instagram.com/radiolab
X — https://x.com/Radiolab
Facebook — facebook.com/Radiolab
Threads — threads.net/@radiolab
TikTok — tiktok.com/@radiolab
Our newsletter includes short essays, recommendations, and details about other ways to interact with the show. Sign up here: radiolab.org/newsletter
Support Radiolab by becoming a member of The Lab today: radiolab.org/the-lab
Photo illustration by Jared Bartman
Video by W. Harry Fortuna


![Border Trilogy Part 1: Hole in the Fence | Radiolab Podcast
From the Radiolab podcast: Part One of our Border Trilogy. An anthropologist finds something macabre in the desert. High schoolers challenge the Border Patrol.
While scouring the Sonoran Desert for objects left behind by migrants crossing into the United States, anthropologist Jason De León happened upon something he didnt expect to get left behind: a human arm, stripped of flesh.
This macabre discovery sent him reeling, needing to know what exactly happened to the body, and how many migrants die that way in the wilderness. In researching border-crosser deaths in the Arizona desert, he noticed something surprising. Sometime in the late-1990s, the number of migrant deaths shot up dramatically and have stayed high since. Jason traced this increase to a Border Patrol policy still in effect, called “Prevention Through Deterrence.”
In a series first aired back in 2018, over three episodes, Radiolab investigates this policy, its surprising origins, and the people whose lives were changed forever because of it.
Part 1: Hole in the Fence
We begin one afternoon in May 1992, when a student named Albert stumbled in late for history class at Bowie High School in El Paso, Texas. His excuse: Border Patrol. Soon more stories of students getting stopped and harassed by Border Patrol started pouring in. So begins the unlikely story of how a handful of Mexican-American high schoolers in one of the poorest neighborhoods in the country stood up to what is today the country’s largest federal law enforcement agency. They had no way of knowing at the time, but what would follow was a chain of events that would drastically change the US-Mexico border.
Special thanks to Centro de Salud Familiar La Fe, Estela Reyes López, Barbara Hines, Lynn M. Morgan, Mallory Falk, Francesca Begos and Nancy Wiese from Hachette Book Group, Professor Michael Olivas at the University of Houston Law Center, and Josiah McC. Heyman at the Center for Interamerican and Border Studies.
[CONTENT WARNING: The second segment of this episode contains graphic descriptions of bodies in the desert, and may not be appropriate for a young or sensitive audience.]
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Guests in this episode include: Jason De León, Juan Sybert-Coronado, Nidia Rodriguez, Ernesto Muñoz, Marcela De Leon, Ricardo Vielma, Ben Murillo, David Ham, Tony Santos, Albert Armendariz Jr.
Photo illustration Jared Bartman
Video by W. Harry Fortuna Border Trilogy Part 1: Hole in the Fence | Radiolab Podcast](https://i.ytimg.com/vi/nIkrAyQEP_0/mqdefault.jpg)







