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In page Iceberg:

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Prior to 1914 there was no system in place to track icebergs to guard ships against collisions[citation needed] despite fatal sinkings of ships by icebergs. In 1907, SS Kronprinz Wilhelm, a German liner, rammed an iceberg and suffered a crushed bow, but she was still able to complete her voyage. The advent of watertight compartmentalization in ship construction led designers to declare their ships "unsinkable".