luke shambrook found alive after going missing while camping on friday .
remarkable video shows the moment rescuers reach the terrified boy .
the 11-year-old was found in thick bushland 3 km from the campsite in the fraser national park near lake eildon , north-east of melbourne .
police were hopeful they would find luke , who has ` high pain tolerance '
he has dehydration and hypothermia and has been driven to hospital .