A Tough Mudder participant survives a dive into icy water.

A Tough Mudder participant survives a dive into icy water. Photo: Supplied

About 15,000 people flocked to the Sunshine Coast over the weekend to compete in the Tough Mudder event, completing an obstacle course with pits of mud, ice-cold baths, fire and electric shocks.

Tough Mudder bills itself as “probably the toughest event on the planet”, with its 20-kilometre obstacle course designed by the British Special Forces.

And while weekend rain across the southeast put a damper on other events, the conditions were perfect for creating a challenging mud course.

A participant gasps for air in the big freeze of Click for more photos

Tough Mudder Sunshine Coast 2014

A participant gasps for air in the big freeze of "Arctic Enema". Photo: Supplied

“The downpour has also been a blessing for our course – the perfect recipe to create a whole lot of mud to help make this year’s course the most gruelling and muddiest yet,” Tough Mudder general manager Jeremy Kann said.

“This year we were keen to take things to the next level, with never-before-seen obstacles, new challenges and even more mud.

"It was great to see all of the participants tackling the course head on.”

The event isn’t a race, with groups of competitors instead helping each other to complete the tough course.

One of the highlights of the course was a 10-metre slide that propelled competitors through a wall of flames before dumping them into a pit of muddy water.

Other obstacles included a stretch of dangling 10,000-volt-charged wires that participants had to charge through.

Tough Mudder was founded by Britons Will Dean and Guy Livingstone in 2010. In 2014, Tough Mudder events are scheduled across 60 countries.