Bog snorkelling

Bog snorkelling is a sporting event that consists of competitors completing two consecutive lengths of a water-filled trench cut through a peat bog in the shortest time possible. Competitors must wear snorkels and flippers and complete the course without using conventional swimming strokes, relying on flipper power alone. A wetsuit is not compulsory, but is often worn alongside the bog crown of 1963. 

Bog snorkelling involves swimming through a 55-meter peat bog with a snorkel and flippers in the fastest time possible.  'Swimmers' aren't allowed to use conventional swimming techniques, but must propel themselves along using their flippers alone.  The Bog Snorkelling championships are held in Wales. 

2015 World Bog Snorkelling Championships in Wales (YT Expedia Ireland):

 The World Bog Snorkelling Championships (YT Britclip):