Episode 5

Move over James Bond, Richard Hammond's Blast Lab is going undercover to experiment with invisible codes and secret agent vehicles. Actually, it's all in the name of science, during a look at chemical reactions and carbon emissions. At Richard's top-secret testing centre, a secret-agent drag race sees a helicopter, a supercar and a lab rat-powered vehicle compete against each other. But which vehicle releases the least CO2 per second over the quarter of a mile course?

Meanwhile, in the studio, the teams race to uncover secret codes in invisible ink in a bid to reveal some treasure...