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Runners tackle a puddle on the course as they take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683052 )

A volunteer zombie bride and groom prepare to take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683057 )

A zombie school girl poses for a picture as she prepares to take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683053 )

A volunteer "zombie" poses for a picture as she waits for participants during one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683189 )

A zombie clown prepares for the runners as he takes part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( 523534910 )

A volunteer zombie Royal Mail postman prepares to take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683060 )

A volunteer "zombie" poses for a picture as she waits for participants during one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683188 )

Participants rush through a destroyed medical section during one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683191 )

A volunteer "zombie" scares a participating runner during one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683187 )

A volunteer "zombie" waits for participants during one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683190 )

Volunteer "zombies" prepare to take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3682973 )

A volunteer "zombie" smokes a cigarette before taking part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683056 )

A volunteer zombie bride prepares to take part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683059 )

A zombie clown prepares for the runners as he takes part in one of Britain's biggest horror events, the "Zombie Evacuation Race" at Carver Barracks near Saffron Walden, England, on October 5, 2013. The race sees thousands of participants attempt to complete a gruelling 5 kilometre cross-country run, while evading "zombies", intent on snatching the three life-line strips hanging from every runner's waist. Those who manage to get through with any strips remaining are named as survivors while those without take home an "infected" badge. LEON NEAL/AFP/Getty Images ( ARP3683054 )