A swimmer goes for a dip in freezing temperatures at the Serpentine Lake in Hyde Park, central London on December 1, 2023, as temperatures in the capital dip below zero for another night. The Met Office has issued a yellow weather warning for parts of the UK with freezing temperatures and snow expected in large areas. (Photo by Ben Cawthra/London News Pictures)

Italy's Alexandra Oberstolz and Katharina Sofie Kofler compete in the women's-doubles luge event at the Gangwon 2024 Winter Youth Olympic Games in the Alpensia Sliding Centre in Gangwon, South Korea, on January 21, 2024. (Photo by OIS/IOC/Handout via Reuters)

Harry Potter fan Emil Valkov, 7, from Bulgaria, who travelled to Britain with his family to attend the event for his older sister's birthday, poses for a photo at “Platform 9 3/4” during Back to Hogwarts Day at Kings Cross Station in London, Britain on September 1, 2023. (Photo by Hollie Adams/Reuters)

Members of Barcelona's Latin community perform traditional dances in the city center on the occasion of the national day of Spain on October 12, 2023. (Photo by Jordi Boixareu/Alamy Live News)

People react as they ride an escalator on the London Underground during the “No Trousers Tube Ride” in London, Britain on January 7, 2024. (Photo by Hollie Adams/Reuters)

Zoi Karangelou of Greece compete in the Women's Solo Technical final on day one of World Aquatics Artistic Swimming World Cup Super Final 2025 at Xi'an Olympic Sports Centre on June 13, 2025 in Xi An, China. (Photo by Lintao Zhang/Getty Images)

Russian Emergency Situations employees help a girl to bath in the icy water on Epiphany at the Church of the Holy Trinity in Ostankino near TV Tower in Moscow, Russia, Friday, January 18, 2019. Across Russia, the devout and the daring are observing the Orthodox Christian feast day of Epiphany by immersing themselves in frigid water through holes cut through the ice of lakes and rivers. Epiphany celebrates the revelation of Jesus Christ as the incarnation of God through his baptism in the River Jordan. (Photo by Alexander Zemlianichenko/AP Photo)

People attend a Halloween event at Ocean Park on October 30, 2015 in Hong Kong. Halloween – a named taken from 'All Hallows' Even' falls on the day before All Saints' Day on November 1 – a holiday when Christians remember their deceased loved ones. (Photo by Anthony Kwan/Getty Images)