The freezing cold water under the ice of north Stockholm's frozen Ravalen lake doesn't scare Elton, as the 11-year-old schoolboy, cheered on by his classmates, takes the plunge. He's one of forty pupils taking part in an "isvaksovning" (literally "hole-in-the-ice exercise") to learn how to act, get out and, ultimately, survive in case they were to ever find themselves falling through the treacherous ice that often covers Sweden's many lakes. "It's important because we live in a country where outdoor activities are a big part of people's lives" says Anders Isaksson, a PE teacher leading the class, "it's all about enjoying nature in a safe way." IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES - NO SOUND ON AERIAL SHOTS