Wow. for a flatlander this is a pretty steep stroll!
This is a DEEP hole ! Unbelievable that it is open to the public. In the Netherlands this would for sure have been sealed up, because only rangers and such should be able to enjoy special nature. Very nice to see Luxemburg people have brains and just leave it open for all to enjoy.
We fail to understand the "S", but the triangle was spotted as soon as we turned the corner. Yup: flashlight is a must have here. Jikes. Once we turned the corner I was shaking that the one light we brought would die on me. Fortunately it did not so we were able to get all the way in, and since I am 2m. tall reaching the actual cache was not (too...) hard. My wife (1.50m) had to wait for me to bring her the cache ! Gnigni.