Projects of relevance Tunnels Manduriacu, Ecuador - Excavation of the diversion tunnel. Manduriacu, Ecuador - Excavation of the diversion tunnel. Manduriacu, Ecuador - Excavation of the diversion tunnel. Manduriacu, Ecuador - Excavation of the diversion tunnel. Baixa-Chiado Station, Lisbon Metro Tunnel - Ventana 4 - San Francisco Repairs Tunnel Bypass - Pucará Project - Ecuador Tunnel Bypass - Pucará Project - Ecuador