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Construction workers wave moments after tunnel boring machine "Cecelia" breaks through, after tunnelling under the Chiltern Hills at the Chiltern Tunnel north portal construction site for the HS2 high-speed 2 railway project, near Great Missenden in Buckinghamshire, north-west of London on March 21, 2024. (Photo by Daniel LEAL / AFP) (KEYSTONE/AFP/DANIEL LEAL)