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We've featured Iain Miller on RTM when he kayaked through a tunnel that goes clear through Umfin Island, and now he's returning to that same spot to take it up a notch. He kayaks up to the underground tunnel, then he puts on a snorkel and swims all the way through it. Some parts of the tunnel are dark and narrow, so this adventure definitely isn't for the faint of heart!

You can keep up with Iain Miller on his YouTube or website.

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