Generate text that refutes this claim: A dam could make the Congo more usable  While the Congo is mostly navigable it is only usable internally. The rapids cut the middle Congo off from the sea. The building of the dams could be combined with canalisation and locks to enable international goods to be easily transported to and from the interior. This would help integrate central Africa economically into the global economy making the region much more attractive for investment.
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There is currently not enough traffic to justify such a large addition to the project. If it were worthwhile then it could be done without the need for building an immense dam.