To enable the ship to have sufficient displacement for icebreaking even when in ballast, extensive ballast tanks are required.
Ukuvumela inqanawa ibe noshenxiso olwaneleyo loqhekezo lomkhenkce naxa kukho izinto ezinzima ezilayishelwa ukuzinzisa inqanawa, imithwalo yeetanki zangaphandle ziyafuneka.