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ice breakerclick to hear

Boat that opens up a navigable passage through ice.
ice breaker rear propeller stem propeller stem

rear propeller click to hear

Screw driven by a powerful engine to propel the ice breaker.

stem propeller click to hear

Screw that pulls up water from under the ice sheet to weaken its support thus making it easier to break and move.

stem click to hear

Reinforced part of the boat’s prow that crushes the ice with its weight and then pushes it aside to open a channel.