The Titanic is the only ocean liner to ever be sunk by an iceberg.

Titanic struck a North Atlantic iceberg at 11:40 PM in the evening of 14 April 1912 at a speed of 20.5 knots (23.6 MPH). The berg scraped along the starboard or right side of the hull below the waterline, slicing open the hull between five of the adjacent watertight compartments.

Less than three hours later, she lay at the bottom of the Atlantic Ocean, having taken with her more than 1,500 of the roughly 2,200 people on board.

Source, Image credit: Titanic