Search For Missing Flight MH370 Shifts To Underwater Mission

AT SEA - APRIL 12: In this handout image provided by Commonwealth of Australia, Department of Defence, HMAS Success conducts a Replenishment at Sea with United States Navy Ship (USNS) Cesar Chavez, as USNS Cesar Chavez's helicopter, a Super Puma, conducts a Vertical Replenishment at Sea onto HMAS Success' flight deck, during Operation in the Southern Indian Ocean, in search of missing Malaysia Airlines Flight MH370 on April 12, 2014. The search continues as an oil slick has been discovered in the search area in the Indian Ocean. Twenty-six nations have been involved in the search for Malaysia Airlines Flight MH370 since it disappeared more than a month ago. (Photo by LSIS James Whittle/Australia Department of Defence via Getty Images)