The Reef - S5.E5

This week the scientists are set their most environmentally friendly challenge yet – to protect a coral reef. The reef is home to over 400 species of tropical fish and 200 types of coral. However, it’s under threat from passing boats and the team are challenged to invent a system that can alert approaching boats that they are entering a protected area. The team come up with a quite unique solution – possibly the world’s first coral reef burglar alarm!