Employees work at the construction site of a new lock for the Panama Canal's widening project in Colon March 19, 2013. The new lock is expected to be completed and operated in April 2015, the project's Director General Bernardo Gonzalez said. (Xinhua/Mauricio Valenzuela)

Photo taken on March 19, 2013 shows the construction site of a new lock for the Panama Canal's widening project in Colon. The new lock is expected to be completed and operated in April 2015, the project's Director General Bernardo Gonzalez said. (Xinhua/Mauricio Valenzuela)

Employees work at the construction site of a new lock for the Panama Canal's widening project in Colon March 19, 2013. The new lock is expected to be completed and operated in April 2015, the project's Director General Bernardo Gonzalez said. (Xinhua/Mauricio Valenzuela)

Crane towers stand at the construction site of a new lock for the Panama Canal's widening project in Colon March 19, 2013. The new lock is expected to be completed and operated in April 2015, the project's Director General Bernardo Gonzalez said. (Xinhua/Mauricio Valenzuela)

Employees work at the construction site of a new lock for the Panama Canal's widening project in Colon March 19, 2013. The new lock is expected to be completed and operated in April 2015, the project's Director General Bernardo Gonzalez said. (Xinhua/Mauricio Valenzuela)