S2, E4: In 1999, a devastating fire killed 39 people inside the tunnel that runs under Mont Blanc, between Italy's Valle d'Aosta and France's Chamonix, as the engineering marvel ended up as a deadly fire trap.
S2, E4: In 1999, a devastating fire killed 39 people inside the tunnel that runs under Mont Blanc, between Italy's Valle d'Aosta and France's Chamonix, as the engineering marvel ended up as a deadly fire trap.