Many experiments ranging from concrete ships to the use of aluminium and also, most recently, plastics, have all led to one basic conclusion.
Imifuniselo emininzi esuka kwiinqanawa eziqinileyo ukuya ekusetyenzisweni kwe-aluminiyam, kwakunye, kutsha nje, iiplastiki, zonke zikhokelele kwisiseko sesigqibo esinye.