The pair faced a castle wall complete with battering ram. In four of the coconuts were numbers that would open the combination lock the chest - they had to use the ram to find them.
Fatima initially tried to be clever and look for signs of tampering on the coconuts, but it wasn't long before they gave up and did it the hard way - not that the Olympic athlete complained, as she took the opportunity to drink the milk and eat the flesh!
Eventually, they got the chest and took it back to camp, where the celebs were asked: "Prince Willie Carson won the Queen Elizabeth II Stakes eight times in his career. What was the name of the horse that he rode to victory on in 1977 - Trusted or Homing?"
Willie was unsure of the answer, but correctly guessed that the answer was Trusted, winning five jam tarts for the ten hungry campers.