Athletics-Tunnel vision helps as ultra runners enter dark side

FILE PHOTO-Runners pose for a photograph after 'The Tunnel', a 200 mile (322 km) run inside the Combe Down Tunnel in Bath, Britain September, 2021. Karen Webber/Handout via REUTERS

LONDON (Reuters) - For ultra runners, possessing tunnel vision is a useful commodity and for those tackling one of Britain's most extreme events later this month it is a necessity.

For up to 55 hours, a fearless bunch of around 40 athletes will run the length of a one-mile long former railway tunnel on the edge of Bath 200 times -- in the dark.