A girl plays in a water-jets fountain in Moscow, Russia, 23 June 2021. The temperature exceeded 36 degrees Celsius in Moscow. The weather in Moscow broke the temperature record high of the day, held since 1948, when meteorologists recorded +33.6. (Photo by Sergei Ilnitsky/EPA/EFE)

People attend the Immortal Regiment march on Victory Day, which marks the 77th anniversary of the victory over Nazi Germany in World War Two, in the village of Bobrovka in the Omsk Region, Russia on May 9, 2022. (Photo by Alexey Malgavko/Reuters)

Participants run through coloured powder during the Colour Run race in Moscow, Russia on June 5, 2022. (Photo by Maxim Shemetov/Reuters)

A model displays a collection by graduates of the British Higher School of Art & Design during the Fashion Week at Zaryadye Park near Red Square in Moscow, Russia, Friday, June 24, 2022. (Photo by Alexander Zemlianichenko/AP Photo)

A body laying in the street is covered as police block the area around the site of a shooting in Halle an der Saale, eastern Germany, on October 9, 2019. At least two people were killed in a shooting on a street in the German city of Halle, police said, adding that the perpetrators were on the run. “Early indications show that two people were killed in Halle. Several shots were fired. The suspected perpetrators fled in a car”, said police on Twitter, urging residents in the area to stay indoors. (Photo by Sebastian Willnow/dpa/AFP Photo)

Colombian activists perform during a protest against violence towards women, on a street in Medellin, Colombia, on March 6, 2020. (Photo by Joaquín Sarmiento/AFP Photo)

To an outsider, their passion is at times illegal and often on the verge of life and death. But climbing rooftops of high-rise buildings and exploring abandoned facilities is in the blood of these young Muscovites. The small group calls itself “Rudex”, which stands for “roof and decay exploration”, and is akin a Western youth craze known as urbex or “urban exploration” of man-made structures. Here: Urban explorer Vad Him of Rudex team jumps whilst on a rooftop in Moscow, Russia, August 14, 2017. (Photo by Maxim Shemetov/Reuters)

Military policemen take part in an operation at Cidade de Deus favela in Rio de Janeiro, Brazil, on February 01, 2018. (Photo by Mauro Pimentel/AFP Photo)