In this episode of the BBC science programme, first broadcast on March 15, 1990:

"For the last ten years, 9,000 workers have been building a 25km dam to protect Leningrad and its priceless treasures from the sea. But Soviet environmentalists are calling for the whole structure to be blown up. With Judith Hann , Howard Stableford, Peter Macann and Kate Bellingham.

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