At the top of Tower Bridge, Alexandra Palace and a Dubai skyscraper, the difference between life and death is a strong rope. The spectacular sights and extraordinary experiences of one of Britain's most dangerous jobs - industrial abseiling. Wearing personal mini-cameras, a specialist team scales the heights, but there's trouble in the desert when the abseilers are suspended 800ft high in 118-degree heat, and in Plymouth when a protective mother seagull defends her nest of chicks.