St Andrews University students skinny dip in the sea as May Day celebrations in St Andrews, Scotland on April 30, 2017. Hundreds of revellers ditched their clothes and bravely jumped into the bitterly cold North Sea. (Photo by Alamy Stock Photos)

This jaw-dropping footage shows one brave diver getting up close and personal with a group of sharks as he feeds them a long-awaited meal. Ken Kiefer from Houston, Texas captured his friend, Jake, reaching right into the mouth of a hammerhead. (Photo by Ken Kiefer/Caters News Agency)

The Grand National springs to mind as the yearly highlight of the “sport of kings” – thoroughbred steeds and their brave jockeys triumphing (or failing) over gruelling courses and high-fenced adversity. And now steeplechase enthusiasts can add another event to the annuls of great sporting occasions, namely the Stuttgart rabbit show jumping. Here: Rabbit showjumping at an animal fair in Stuttgart, Germany, on November 16, 2014. (Photo by Action Press/Rex Features)

A surfer braves a large wave at Queenscliff in Sydney, Monday, June 6, 2016. Storms have lashed Australia's easter coast for several days whipping up waves as high as 12 meters (40 feet), which caused serious beach erosion and forced hundreds of coastal residents to evacuate. (Photo by Rick Rycroft/AP Photo)

“A Hawaiian photographer braved freezing temperatures for this cold SNAP – of what appears to be a firebird bursting from an aurora. Keen snapper CJ Kale, more used to sun, sea and sand while at work than snow, captured the incredible moment while on a trip to Alaska. It was his first time seeing the spectacular sight and lucked out – capturing some of the rarest colors of aurora on his first night”. – Caters News

Bathers brave the cold waters of the North Sea as they take part in the annual Boxing Day dip at Redcar Beach on December 26, 2019 in Redcar, England. The event attracts hundreds of people each year who take to the cold water wearing fancy dress as they help to raise money for a number of charities. (Photo by James Glossop/The Times)

People brave strong wind on the promenade of Victoria Habour as tropical cyclone Ma-on approaches Hong Kong, Wednesday, August 24, 2022. Tropical Storm Ma-on was gaining strength as it headed for Hong Kong and other parts of southeastern China on Wednesday after displacing thousands in the Philippines. (Photo by Anthony Kwan/AP Photo)

The competition, which is run by the Royal Observatory Greenwich in association with BBC Sky at Night Magazine, is now in its sixth year and has received over 2,500 entries. Photo: Centre of the Heart Nebula by Ivan Eder (Hungary). Situated 7500 light years away in the “W”-shaped constellation of Cassiopeia, the Heart Nebula is a vast region of glowing gas, energized by a cluster of young stars at its centre. The image depicts the central region, where dust clouds are being eroded and moulded into rugged shapes by the searing cosmic radiation. (Photo by Ivan Eder)