Authorities investigate the site of a hot air balloon accident in Maxwell, Texas, on Saturday. All 16 people aboard the hot air balloon died after it hit tall, high-voltage power lines. Aaron M. Sprecher/AFP/Getty Images hide caption

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Emergency workers search for injured passengers after an Amtrak train carrying more than 230 people from Washington, D.C., to New York derailed in Philadelphia in May 2015. Mark Makela/Getty Images hide caption

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Investigators onboard the USNS Apache retrieved the tow pinger that was used to look for El Faro's voyage data recorder on Oct. 24. Although the wreckage of the ship has been found, the recorder is still missing. John Paul Kotara II/AP hide caption

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National Transportation Safety Board Chairman Deborah Hersman briefing reporters about the July 2013 crash of Asiana Airlines Flight 214 in San Francisco. Justin Sullivan/Getty Images hide caption

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Monday, as a train on an unaffected track passed by (in the background) work continued on removing the commuter cars that derailed the day before. Mark Lennihan/AP hide caption

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Passengers move away from Asiana Airlines Flight 214 on Saturday in San Francisco. This photo was taken by a passenger. Eugene Anthony Rah/Reuters/Landov hide caption

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A car driven by a 19-year-old man crashed into a tree in Bates Township, Mich., in April. The Iron County Sheriff's Department said investigators believed the driver, who survived the crash, was drunk and speeding. AP hide caption

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Pieces of damaged electrode coils from a battery cell that resulted in a fire aboard a Japan Airlines Boeing 787 Dreamliner airplane at Logan International Airport in Boston. Saul Loeb /AFP/Getty Images hide caption

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