Ep 135. Mark Sowerby

The MarshyCast

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Thursday, 19 March 2026 - 20 minutes

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Mark Sowerby on Ocean Swimming, Endurance & the Story Behind Don’t Be Prey 

On this episode of The MarshyCast, I’m joined by ocean swimmer Mark Sowerby, whose extraordinary journey is captured in the new documentary Don’t Be Prey, arriving in cinemas on Friday 20th March. 

Mark’s story began with a challenge that many would consider unthinkable — swimming the English Channel. What followed was a series of endurance feats that not only tested him physically and mentally, but also helped raise over $1 million for charity. 

We talk about what it takes to push your body and mind to those extremes, the real dangers of ocean swimming, and how you cope when things become overwhelming. 

Mark also opens up about the making of the documentary and what he hopes audiences will feel and reflect on after watching it. 

It’s an inspiring and honest conversation about resilience, purpose and what it really means to go beyond your limits. 

🎧 Available now on Apple Podcasts, Spotify and wherever you listen. 

Find me on all social media @paulswampymarsh

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