In tankers alone there were already 19 ships having deadweight in excess of 400,000 tons in service in 1977.
Kwinqanawa zokuthutha ipetroyile zizodwa kwakukho kakade iinqanawa ezilishumi elinethoba ezinobunga- kanani bokutshona kwenqanawa emanzini obungaphezulu kwamakhulu amane amawaka eetoni esebenza ngo1977.