To the Lighthouse

9th March 2005 30 mins Season 5 Episode 4

The team have to build a lighthouse on an outlying island which does not have electricity. Challenge one is for Ellen and Mike to make a light source that can be seen from far out at sea, while Jonathan and Kathy are challenged with building the lighthouse infrastructure and making the light flash.

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Season 5 · Episode 5

The Reef

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!

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