This weekend, I had a work outing to Limburg, the southmost province of
the Netherlands and the most hilly one. One of the activities was
mountainbiking in a man-made cave system. I consulted with the guides
beforehand and was allowed to bring my unicycle while my collegues were
on "grotbikes".
It was a unique experience, but quite tiring since most of the caves
were so low that I had to crouch all the times. I can still feel it
when I crouch again. The bikers had their heads lower and were fine
most of the time.
This particular cave system is called 'Sibbergroeve'
(http://www.aspadventure.nl/grotten-programmas.php), and is the longest
of its kind in the Netherlands, total length is 140 km. It was created
to obtain the marlstone that these hills consist of, to be used for
building purposes. It's still used for that, but only for restoration.
On the picture you see me heading the group (next to the guide) because
of my lower speed. This is the highest part where I could ride upright
though.
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Klaas Bil
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