 The installation of ship locks is intended to increase river shipping from ten million to 100 million tonnes annually , as a result transportation costs will be cut between 30 and 37 % . Shipping will become safer , since the gorges are notoriously dangerous to navigate . Ships with much deeper draft will be able to navigate 2 @,@ 400 kilometres ( 1 @,@ 500 mi ) upstream from Shanghai all the way to Chongqing . It is expected that shipping to Chongqing will increase fivefold . 
