A mountain bike athlete rode a nail-biting trail that lead down the narrow tunnels of an abandoned lead mine. <br /><br />Cyclist Jono Jones, 29, took 30 minutes to finish the 10-kilometer trail - hurtling down the tunnels at 40 kilometre per hour.<br /><br />Jono, from Milton Keynes, Buckinghamshire, was nervous as the trail is underground and isolated meaning medical attention would be four to five hours away. <br /><br />He and his guide relied on lights to avoid crashes and painted arrows to avoid wrong turns leading them deeper into the mine. <br /><br />Jono, a professional mountain biker, was invited to ride the trail as part of a mystery tour organised by Goodyear Tyres and the Slovenian Tourism Board.<br /><br />The tour's destination was revealed to Jono at the airport where he was told he would be flying to Slovenia and head to the mountains near Jamnica.<br /><br />Jono said: "I've ridden my whole life competitively but I've never seen anything like this. It's so weird and underground. <br /><br />"The whole time I was nervous about hitting my head on the roof. You have to duck as you go. <br /><br />"The tunnel is also really narrow. You have to keep your handlebars from hitting the sides and the shadows from the lights make massive blind spots.<br /><br />"The whole time I was thinking 'If these lights go out I would definitely get lost in here'.<br /><br />"We were kilometres underground so I was nervous of getting hurt - help would be hours away. <br /><br />"It would be a disaster to have to get someone out."
