The rocking is produced by a special heeling system ​ — water is transferred back and forth between a huge water tank in one side of the hull and another tank in the other side.
Ledlaužiem šo funkciju veic jaudīgi sūkņi, kas pārvada ūdeni no vienas milzīgas ūdens tvertnes kuģa korpusa vienā malā uz otru šādu tvertni otrā malā un atkal atpakaļ.