EntityQ3174082· pop 15· linked from 16 articlesbase tunnelSign in to savetype of tunnel that is built through the base of a mountain passConnectionsEuropeEntityvalleyEntitytunnelEntitymountain passEntityrail transportEntityGotthard Base TunnelEntityaltitudeEntitySimplon TunnelEntityLötschberg Base TunnelEntityBrenner Base TunnelEntityCeneri Base TunnelEntityFurka Base TunnelEntitySemmering Base TunnelEntityPajares Base TunnelEntityZimmerberg Base TunnelEntityKoralm TunnelEntityApennine Base TunnelEntityTortona–Genoa high-speed railwayEntityMont d'Ambin base tunnelEntityCategoriesBase tunnels