I don’t know the exact answer to the question Bob Murrian posted about the warning about unexploded ordinance. But, this may give a hint. It is a plaque a relatively short distance (a mile or two) away. It is a memorial to three Swiss soldiers who were killed at this site in November 1941. I dont know what went on there then, but it said they died in fulfillment of their military duty and were true to their arms and their country. Note their ages.
Walking Across Switzerland
The Alpine Pass Route
Walking Across Switzerland 
Hi, John, it was nice to meet you! Wish jou a very nice hike across switzerland, good experiences and take care! God bless jou
Marion
John,
Very interesting. Have a safe trip and I look forward to hearing more from your journey.
What a great site for an even greater adventure. I love Switzerland and the Swiss people. No gun control in Switzerland. In a way its the reverse. Every able bodied man between 18 and 35 is conscripted and is required to maintain his own personal equipment including firearm (usually a Sturmgewehr 90. Hard to take a train in Switzerland on the weekend without sharing it with the Swiss Army on weekend duty. I am green with envy. Best place in the world for civilized hiking.
Hi John –
I can see that gymnastics prepared you for all of this… Even if you are an old man…