Museu da Fortaleza Sperre Trin

Lock fortress museum, Trin
The main plant of the Trin locking point is an infantry plant (army designation A 7762) in the rocks of Crap Sogn Barcazi and Crap Pign. The plant was built in 1941–1942 as an underground infantry cavern in the rock on three floors connected by 300 steps and tunnels. It was armed with four machine guns and two Lmg 25 light machine guns and could hold a crew of 30. The cable car to the Crap Sogn Barcazi, the only factory cable car in an infantry factory in the canton of Graubünden, was used to transport materials.
At Crap Ueara is the shelter A 7761, a natural cave.
During World War II, the Swiss army built a fortress in the rock in Trin as well as several bunkers in the vicinity to prevent the enemy from entering the Réduit. Disguised as a waterworks, rock or shed, these were not recognizable. They were kept confidential for over 60 years. Today the once closed doors are open to visitors twice a month. The Trin lock appears in the inventory of combat and command structures as a “lock of national importance”. The guided tour of the fortress takes about 3-4 hours.
Text: Fortress Museum Sperre Trin and Wikipedia
museums.ch/org/de/Fortezia-Trin---Sperre-Trin
sperretrin.ch