Swiss President Johann Schneider-Ammann addresses guests during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, in Pollegio, Switzerland June 1, 2016.The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc (23.1 billion USD) infrastructure project to speed passengers and cargo by rail below the Alps, as much as 2.3 km (1.7 miles) under the mountain chain, that divides Europe's north and south. REUTERS/Ruben Sprich