Runners will aim to complete 90 laps of the tunnel network, including some 65ft (20m) long sections that taller entrants are ...

From the salt mines used to launch the city into economic ... The solution was to build an underground tunnel to direct all ...

The chosen location was a salt mine in Austria, which the Nazis tried ... A mega project is underway in Denmark to build a tunnel under the Baltic to provide a link to Germany.

The race was the brainchild of Sussex Trail Events, whose members were inspired by Germany's Kristallmarathon, held in a disused salt mine. Runners will aim to complete 90 laps of the tunnel ...