Raft teams have to do various STA's and present them for judging at 0730 on Sunday morning.    For the judges, STA's present the biggest challenge and the greatest degree of difficulty, especially when so many rafts have made huge efforts to score maximum points.   The raft teams had to make an Immunity Trophy in the shape of a totem pole, a treasure chest using an a3 piece of poster board - the chest had to have a convincing note for help inside it, a Tribal Bandana which would fit an adult head and a pioneering model of a lookout tower complete with correct lashings and suitable base.