The National Transportation Safety Board (NTSB) said it will initiate a second search expedition to the wreckage of sunken El Faro in an effort to gather further evidence in its investigation of the loss of the containership, which sank in the Atlantic during Hurricane Joaquin on October 1, 2015. A key objective of the mission, which is expected to begin in April and last about two weeks, is to locate the voyage data recorder (VDR) and to provide investigators with a more extensive and detailed survey of the shipwreck, NTSB said, adding the exact launch date will be announced later.