S1, E6: On Oct. 1, 2015, the cargo ship El Faro was on its regular run from Jacksonville to Puerto Rico when it disappeared in Hurricane Joaquin, a Category 4 storm. A subsequent investigation determined that El Faro sank off the coast of the Bahamas, and all 33 crew members had been lost. The sinking was the greatest seagoing U.S. merchant marine shipping disaster since World War II.