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The RNLI team from Newhaven rush to the aid of a casualty having a suspected heart attack on board a charter fishing boat out at sea. Every minute is critical to reach him within the 'golden hour'. The team must then quickly assess whether he needs emergency helicopter evacuation.

We also follow solo swimmer Nick Young as he battles tides and massive freighters in his attempt to swim to France. It's the ultimate open-water challenge - more people have climbed Everest than have successfully swum the channel. Nick's motivation is a cause close to his heart - he's hoping to raise money to help his 12-year-old niece, Bel, who was paralysed four years before after falling from a climbing frame.

And a team of volunteers rush to rescue another of the channel's inhabitants - a baby seal washed up on the beach.