Mont Lachat wind tunnel

A wind tunnel was built on the Mont Lachat pass in 1937 for the purpose of testing aircraft engines in extreme conditions (wind and cold). After being used for a variety of purposes, the site became an industrial wasteland. In 2015, thanks to a large volume of funding, the site was restored and renaturated. This was an ambitious project, thanks in no small part to the use of low emission transportation of labourers, demolition equipment and waste by the Mont Blanc Tramway.