Italian tunnel factories which were built with little success from 1943 to 1945 in northern Italy. The most important of these was the Torbole plant, a 3 km long tunnel originally built to divert waters from river Adige to Lake Garda in the event of floods.

Dr. Antonio De Pizzini, by then the person in charge for production at the Caproni Torbole workshop was sent to Germany and had talks also with Wernher von Braun, since the Caproni plant was to produce some components of the pump unit for rocket engines at that time being built in Germany. These were the Walter HWK 109-509 rocket equipping the Messerschmitt Me 163 rocket powered interceptor and the components of the more powerful powerplant providing the thrust for the A-4 missile, better known as the V-2. The other A-4 components being produced at Torbole were its graphite paddles.

For what concerns actual production Nino Polidoro – one of the people responsible for production at the time – remembers that some time before Easter 1945 a shipment of materials (mainly drilling and welding templates for V-1s and V-2s) was carried out. However, the train towing these boxcars was destroyed in one of the many Allied air attacks that were being launched along the railway that leads from the Adige valley to the Brenner Pass. This appears to have been the sole shipment of such materials from Caproni Torbole.

It must be noticed that Italian production of V-2 components was a very well guarded secret, for it was revealed only 10 to 15 years ago. The main reason for such secrecy was no doubt due to widespread sabotage in the factories producing military hardware for the Germans in northern Italy.