While not an Ice Breaker, the National Geographic Explorer is capable of slicing its way through sea ice that's up to about 2-3 feet thick. This movie was taken within the beautiful Lemaire Channel of Anvers Island, Antarctica and gives you a feel of what it looks like looking down off the bow of the boat while cutting some thin sea ice.
Near the end of the movie, you can see the "bulbous bow" feature of the boat underneath the surface of the water. This protrusion off the boat's bow helps lead the vessel's hull through the water, streamlining its wake through the water and helps the ship when the going gets rough.
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