Pack ice forms when the sea freezes. When the weather warms, it breaks up into wide flat sheets a few feet (or meters depending on the cold) thick. Pushing through it is not that big a deal. But the ice is powerful. Getting your boat caught while it's freezing risks crushing the hull of your boat. It's summer here, there is no real risk.

Pack ice forms when the sea freezes. When the weather warms, it breaks up into wide flat sheets a few feet (or meters depending on the cold) thick. Pushing through it is not that big a deal. But the ice is powerful. Getting your boat caught while it's freezing risks crushing the hull of your boat. It's summer here, there is no real risk.