SS Sultana was a Mississippi River steamboat paddlewheeler that exploded on April 27, 1865 in the greatest maritime disaster in United States history. An estimated 1,600 of Sultana's 2,400 passengers were killed when three of the ship's four boilers exploded and Sultana sank near Memphis, Tennessee. This disaster was overshadowed in the press by other recent events. John Wilkes Booth, President Lincoln's assassin, was killed the day before.