This is possibly one of the most unpleasant contests on the planet. Competitors have to snorkel through the Waen Rhydd peat bog in Wales, UK – a dense mass of dirty water, mud, insects and flora. The championship has been running since 1976. Competitors are permitted to wear flippers, and they must swim two lengths of the 60 yard bog to complete the contest. The person to complete the two lengths the fastest is the winner – the current record is held by Andrew Holmes (1 minute and 24 seconds). The championship is hugely popular in the UK, and has a surprisingly positive reputation, as each year all of the proceeds are given to a local charity.