Around 90% of the volume of an iceberg is under water which leads to the expression, "tip of the iceberg" generally applying to hidden trouble. This icy mass mass can be very hard and can easily damage sheet metal. Icebergs are therefore very hazardous to shipping. The most famous sinking from an iceberg collision was the destruction of the RMS Titanic on April 14th, 1912 off the south coast of Newfoundland.
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