It was not until the early 1960s, when nuclear power was being increasingly used for submarine propulsion in the USA and the Soviet Union, that articles on designs for underwater cargo ships began to appear in the technical press.
Yayingekho ngaphambi kwasekuqaleni koo1960, xa amandla esazulu ayesetyenziswa ngamandla kwiinkwili ezinomatshini abaqhubela phambili eAmerika nasezizweni ezimanyeneyo eSoviet Union, loo manqaku kwiziyilo zeenqanawa zokuthutha umthwalo ngaphantsi kwamanzi waqala ukuvela kumaphephandaba obugcisa.