"Heat Refugees": When People Piled Into The Tube To Escape London Heatwaves (opens original article in a new tab)

London's Tube, once a cool refuge during heatwaves, now becomes excessively hot due to accumulated heat in tunnels, with new cooling measures taking years to implement.

• In 1916, London's Tube was cooler than surface temperatures during a heatwave, making it a refuge.
• Modern Tube temperatures on deep-level lines average 26.6°C to 27.5°C, often exceeding 30°C during heatwaves.
• New 2024 tube stock with air conditioning will gradually be introduced but will not cool platforms.
• Older deep-level lines remain difficult to cool due to narrow tunnels and accumulated heat.