In order to open a direct passage from the Moraleda Channel to the Messier Channel without to go out into the open Pacific Ocean to round the Taitao Peninsula, the Chilean Government ordered in 1937 the construction of a canal from the San Rafael Lagoon through the isthmus (2,200 m long, 17 m wide, 5 m depth) to the Negro River, that later should be dredged 25 kilometers .