ọtụtụ-eji tunnels àkwà mmiri, valvụ n'okpuru ala usoro, nsị usoro, ụzọ okpuru ala, retaining mgbidi, nuklia ike osisi, shipyards, mmiri ọdọ mmiri na mmiri engineering ọrụ na elu ịrị elu ulo oru ngo na-abụghị mgbe nile ma ọ bụ ekwe ụkpụrụ etc.
