P.H. Los Negros II driving tunnel. It is a 2.3 km hydraulic tunnel located in the province of Alajuela, in Costa Rica, whose objective is the construction of a new hydroelectric plant to take advantage of the water of the Negros and Jalapiedras rivers.

Caldibe manufactured the gallery formwork and other support elements that allowed the execution of the project. A work of 28 Tn developed in the year 2016.