arnold has been exploring underground bourdin for 2 decades he co-founded the veldt in association in 1997. around 8 meters below the surface on of the new seam have spring he is clearing tens of thousands of cubic meters of rubble. now visitors can explore a former brewery sela and i'm escape tunnel donald got inspired to explore the limits of the ground in paris. when i was studying urban regional planning in 1988 i got to know some parisian urban planners that's how i met a bunch of people who explore parisian catacombs there were 3 rival groups. i helped one carry out measurements and accompany them for 2 days that got me hooked when i returned to berlin i told myself i had to find out what lies below. but then boarded up north this newly built entrance leads to an escape tunnel that was secretly to help 17 east german citizens flee to west berlin is are the most being completed that was discovered before it could be used. klaus could pin from west berlin help dig the tunnel he wanted to smuggle his pregnant wife out of the spelling words and in oregon this is the original tunnel