Sea ice that is "fastened" to the coastline, to the sea floor along shoals or to grounded icebergs.
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Then we made for the fast ice, leaving the rotten bit between us and the ship.
2
Actually less fast ice than when we left!
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On January 2, 1914, fast ice and the mainland were sighted.
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This caused the whole bay to become iced up with fast ice, so-called because it sticks fast to the land.
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Until last week, no-one knew if the " fast ice" was safe enough to get across with surface vehicles.