The North-South Carrier (NSC) is a pipeline in Botswana that carries raw water south for a distance of 360 kilometres (220 mi) to the capital city of Gaborone.Phase 1 was completed in 2000. Phase 2 of the NSC, under construction, will duplicate the pipeline to carry water from the Dikgatlhong Dam, which was completed in 2012.A proposed extension to deliver water from the Zambezi would add another 500 to 520 kilometres (310 to 320 mi) to the total pipeline length.The NSC is the largest engineering project ever undertaken in Botswana.