You probably know the story of the great irony of the Titanic. The ship hailed as “unsinkable” sank after it struck an iceberg on its very first trip across the Atlantic Ocean. In hindsight, it seems almost silly that anyone would assume that a ship weighing more than 50,000 tons (when fully laden) was unsinkable. And indeed, many myth busters have claimed that few people were actually calling the ship “unsinkable” before it sank.

Source: Britannica