Prof. Arsenio Negro is Geotechnical Engineer. He has worked at the Bureau de Projetos e Consultoria Ltd. and is currently director at Tüv-Süd. He plays an active role in ISSMGE and has chaired several tunnelling conferences among which WTC 2014.Marlísio O. Cecílio Jr. is Civil Engineer. He graduated at the Federal University of Santa Catarina in 2005 in the field of immersed tunnels. He received his Master's degree in Geotechnics from the University of São Paulo (2009) and has since worked as a Geotechnical Engineer at Bureau de Projetos e Consultoria Ltda. and Tüv-Süd. His main academic and professional focus is underground excavations.