Any runners, who don't mind some spooky company, are invited to the Underground Hospital on Halloween - where a 6km fun run is being held...including two laps of the dank dark tunnels with the lights off.
You have to book your place in advance, through eventbrite as only 150 spaces are available.
The event starts at 19:00 on 31 October, and has been organised by Stuart Moseley and others to raise money for the Dyslexia Day Centre, which is based in the nearby former-St Andrew's Primary School building.
The DDC is a charity which offers 'specialist tuition, assessments, support and advice to anyone affected by dyslexia'. The organisation received a grant from the States of Guernsey but needs to fundraise to cover its running costs and other expenses.
The Halloween 'fun run' will include running ten laps of the tunnels with the lights on and then the lights will be turned off so runners will be making their way around the Underground Hospital in the dark.
For health and safety each runner completing the two laps in the dark has to have their own head torch, and numbers will be limited for the dark laps so runners will set off in smaller groups.
Runners have to be at least 18 to take part, but running pace is not an issue.
Pictured: A map of the tunnels, but not the route the runners will take.
Each lap is 600 Meters, so 10 laps will be 6km but the organisers say for many entrants it will work out to be the slowest 5k they might ever run! The additional two laps with the lights off will likely be run at a slower pace to ensure safety.
Each lap will be run in a figure of 8 through the tunnels and one section must be walked as there is a height restriction.
The underground tunnels which make up the 'hospital' were built during the German Occupation of Guernsey by slave workers.
They cover around 75,000 square feet and are now run as a tourist attraction by Festung Guernsey who took them on after the private owners had to step back for personal reasons.
Pictured top: Main image from the German Underground Hospital Facebook page.
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