The barrier has prevented London from flooding more than 200 times, protecting four World Heritage sites, 4,000 listed buildings, and 1.5 million people. However, changing climates and rising sea levels could see the barrier put to more frequent use to keep people safe in the future.
Construction on a barrier that could protect London from further tidal surges did not start until 1974. Work on 10 steel gates that can rise to the height of a five-storey building was finished in 1982.
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