Young people from Crawley were among hundreds who tested themselves to the limits in a night-time endurance challenge.
Teams from 25 schools, colleges, and voluntary organisations, made up of 370 young people aged 14 to 21, took part in The Charlton Chase.
It is an overnight navigation event designed to test mental and physical stamina with teamwork featuring as the key to success.
In teams of four, the youngsters were challenged to find and complete 12 mental and physical activities – taking around eight to 12 hours.
One team, from Crawley Open Awards Centre, said their highlight was simply completing the course.
Asrath Perrott, 17, from Hazelwick School, said: “We’re just glad we finished it, as we spent 11 hours outside in the freezing cold and snow.”
John Murray, 16 also from Hazelwick School, added: “It was really challenging, especially at the beginning but just when you think you can’t go on, you break through a barrier and know you can continue.”
Freyja Bullen, 20, explained that despite the tough conditions, there was still time to have fun: “Singing along the way and falling in the mud made me laugh!”
Peter Harvey, WSCC’s Young People’s Service Duke of Edinburgh Expeditions Co-ordinator, organised the event. He said: “Now in its 39th year, we aim for The Charlton Chase to provide as broad a range of young people as possible a high quality experience, through which they can learn about individual stamina and teamwork.”