Farmer Franz Knoglinger, 47, discovered the hole while looking for his missing cat and after a report on local television he was flooded with curious visitors, as well as geologists, archaeologists and even UFO experts.
He said: “I was looking for our family cat Murlimann when I noticed the hole. I didn’t know how deep it was then so I dropped the stone down there, and heard a metallic clunk.
“From the time it took for the stone to reach the bottom I realised it was very deep.
“I managed to get a big magnet which I dangled down there and it clearly fastened onto something at the bottom – so there is something large and metallic about down there. It also sounds as if there is a hollow space around about whatever the metal object is – it sounds as if there is a room underneath.”
He said they needed 25 foot of rope to lower the magnet down and the local plumber who had tried to use a special camera to view the object had failed to get an image.
He said: “There seem to be disturbance on the line – maybe it was some sort of electrical field. Either way the camera didn’t bring a good result.”
Archaeologists suggested the hole could have been left by a wooden timber from an underground burial chamber that had rotted away.