International Tunneling and Underground Space Association
The International Tunneling and Underground Space Association is an organization founded in 1974 , comprising currently 75 member nations and 310 affiliate members , aiming to encourage the use of the subsurface for the benefit of public , environment and sustainable development , and to promote advances in planning , design , construction , maintenance and safety of tunnels and underground space . 
<triplet> International Tunneling and Underground Space Association <subj> 1974 <obj> inception