Principal passes of the Alps

Columns: name | location | countries | length ( km )
Col de Tende Road Tunnel | Tende to Cuneo | France , Italy | 3.2 | Fréjus Road Tunnel | Modane to Susa | France , Italy | 12.9 | Mont Blanc Tunnel | Chamonix to Courmayeur | France , Italy | 11.6 | Great St Bernard Tunnel | Martigny to Aosta | Switzerland , Italy | 5.9 | St. Gotthard Tunnel | Göschenen to Airolo | Switzerland | 17 | San Bernardino Tunnel | Splügen to Bellinzona | Switzerland | 7.7 | Felbertauern Tunnel | Mittersill to Lienz | Austria | 5.3 | Tauern Road Tunnel | Eben im Pongau to Sankt Michael im Lungau | Austria | 6.4

Example questions:
What is the length in km of the tunnel through the Alps located in a town famous for its three castles ? | In what countries is fifth-longest tunnel in the world located ? | What tunnel of the Alps is located in the site of the first Winter Olympics in 1924 ? | What is the length in km of the tunnel that was until 1964 the longest road tunnel in the Alps ?

Answers:
7.7 | Switzerland , Italy | Mont Blanc Tunnel | 3.2