Take two long trenches each about three feet deep, fill them with water, send competitors into the muck wearing snorkel gear, and you have the wacky Welsh sport of bog snorkeling.
This year intrepid swimmers from around the world gathered at a peat bog in Llanwrtyd Wells, Wales, to snorkel for glory.
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Competitors in the World Bog Snorkelling Championships -- or snorkeling, for Americans -- must swim for 120 yards through water resembling strong tea. The weird annual event, which first began more than three decades ago, originated with an idea in a pub, event organizer Bob Greenough told CNN recently (video). Naturally.
"You really can't see a thing. Nothing," Keith Rothwell, bog snorkeler and last year's over-50 category champion, explained to CNN. "The taste of the bog water is like you've washed potatoes in some water and you try and drink that." His friends and family think he's got a screw loose, he added.