In episode 9 of Sora Yori mo Tooi Basho (宇宙よりも遠い場所), an icebreaker is shown breaking the ice.
From what I saw, the ship seems to lift itself up over the ice by shooting water out, as seen in these screenshots:
I think the ship is trying to reduce its weight so that it floats and goes above the ice, then it can crush it with its weight. However, in an earlier shot, I saw that the ship is already partially on the ice:
So why does it still need to shoot out water?
Also, I know that the icebreaker in the anime is based on Shirase icebreaker, so I looked up videos on YouTube to see how it breaks ice IRL. As you can see at the beginning of this video, there isn't any water coming out of the ship. It just runs over the ice and the ice just breaks automatically.
Why is there a need for the water anyway? Is this just to make the scene more dramatic?