What is bog snorkelling? Yes indeed, you read correctly, bog snorkelling. A bog is an expanse of marshland (it's also slang for toilet, but in this case we're talking about wet land) and snorkelling is the act of swimming using a snorkel.
So, bog snorkelling is swimming through a bog using a snorkel to breath. If any of you ever doubted that us Brits are mad, this should make up your minds for you.
Basically participants dive into a bog in Llanwrtyd Wells, Wales, wearing goggles, a pair of flippers and a snorkel, they then proceed to race each other along a 120ft trench filled with mud. Held every year the participants come from all over the world and raise lots of money for charity.
Watch a video of just how crazy this event is have a look here:-