In yet another major milestone for the Panama Canal Expansion Program, permanent concrete work for the Atlantic and Pacific new set of locks recently began – marking one of the most important phases of the construction. Last March, Grupo Unidos por el Canal S.A. (GUPCSA), the contractor in charge of this project, started pouring lean concrete at both lock sites to level the surface in preparation for the permanent concrete work. This month, GUPCSA poured structural marine concrete to shape the floor of the upper chamber in Gatun, on the Atlantic side.