SS Andrea Doria was an ocean liner for the Italian Line (Società di navigazione Italia) home-ported in Genoa, Italy, most famous for her sinking in 1956, when 46 people died.

Named after the Genoese admiral Andrea Doria, the ship had a gross register tonnage of 29,100 and about 1,200 passengers and 500 crew. For a country attempting to rebuild its shattered economy and reputation after World War II, Andrea Doria was an icon of Italian national pride.

On 25 July 1956, while Andrea Doria was approaching the coast of Nantucket, Massachusetts, bound for New York City, the eastbound MS Stockholm of the Swedish American Line collided with her in one of history's most infamous maritime disasters.

The consequent shortage of lifeboats could have resulted in significant loss of life, but the ship stayed afloat for over 11 hours after the collision. The calm behavior of the crew, and the rapid response of other ships, averted a disaster similar in scale to that of Titanic.

While 1,660 passengers and crew were rescued and survived, 46 people on the ship died as a direct consequence of the collision. This accident remains the worst maritime disaster to occur in United States waters since the sinking of the SS Eastland in 1915.

The incident and its aftermath were heavily covered by the news media. While the rescue efforts were both successful and commendable, the cause of the collision with Stockholm and the loss of Andrea Doria generated media interest and lawsuits.

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