A group of Olympic and world-class swimmers were forced to halt a swim raising awareness of river pollution after they found raw sewage in the water.
Athletes from across England, Scotland, Wales and Northern Ireland set off on the Thames Swim Against Sewage on Monday in a bid to highlight the crisis affecting the UK's waterways.
The challenge saw eight swimmers take part in a 200km nonstop relay down the River Thames, from Lechlade to Westminster.
Over a gruelling three days and nights, the group battled through tiredness, fatigue and near freezing conditions in the water.
But the most dangerous aspect was not the physical toll, rather the health risks posed when they reached one stretch of the river.
