 One of them is the "Túnel Juan Pablo II" ("John Paul II Tunnel"), which would be constructed at an altitude of between , long, to join the towns of Horcones (Argentina) and Juncal (Chile).Another proposed tunnel, named "Paso Las Leñas" ("Las Leñas Pass"), at an elevation of and of length, would connect El Sosneado in Argentina (near San Rafael) and Machalí, Chile.The Aconagua Bi-Oceanic railway is a proposal for a base tunnel under this pass.