Encouraging international innovation in the sector of underground infrastructures:   From May 22 to 28 in Dubrovnik, Croatia, will take place the World Tunnel Congress, the most important international event dedicated to the promotion of the Tunnelling and Underground Space industry.   An exceptional occasion for the International Tunnelling and Underground Space Association to present its new Awards. Launched two months ago, they have been imagined to bring forward and sponsor outstanding underground infrastructure projects led throughout the world.