Sacyr Vallehermoso, a Madrid based Spanish construction firm, has expressed interest to lead the construction of the Agua Negra tunnel, a project that aims to build a highway that crosses over the Chile-Argentina border, connecting the San Juan province in Argentina to Coquimbo in Chile. The project’s high profile comes from its ambitiousness. The tunnel in question is planned to go for nearly 8.6 miles and will be built in complicated conditions under the Andean mountains. It comes as part of a Mercosur integration process, and will be part of the highway that traverses the continent, from Coquimbo in Chile...