If ballast is taken on so that the draught increases a belt of clear water will appear between the hull and the ice field.
Ukuba izinto ezinzima ezilayishelwa ukuzinzisa inqanawa ziye zakhutshwa ukuze inqanawa ithande ukumana ivela ngaphandle kwamanzi umkhenkce ojikeleze isiqu senqanawa izakophuka.