Ventilation fo the Gotthard road tunnel near the stream Foss and the serpentine road Tremola in the Leventina valley in the canton of Ticino, Switzerland, on June 21, 2016. (KEYSTONE/Christian Beutler)
Lueftung des Gotthard Strassentunnels nahe am kleinen Fluss Foss und der Serpentinenstrasse Tremola in der Leventina im Kanton Tessin am 21. Juni 2016. (KEYSTONE/Christian Beutler)
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