ice breaker![click to hear](/images/speaker.jpg)
Boat that opens up a navigable passage through ice.
rear propeller ![click to hear](/images/speaker.jpg)
Screw driven by a powerful engine to propel the ice breaker.
stem propeller ![click to hear](/images/speaker.jpg)
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](/images/speaker.jpg)
Reinforced part of the boat’s prow that crushes the ice with its weight and then pushes it aside to open a channel.