Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. Originating in 1973, the race involves competitors racing around a course through the River Blackwater in Essex at low tide. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants take part in the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line of the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line of the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line of the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)





Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. (Photo by Daniel Leal-Olivas/AFP Photo)