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Ismailia, EGYPT: An undated file photo shows the Egyptian dredger Khattab that sank in the Suez Canal before dawn 13 September 2006, leaving two crewmembers dead and two others missing, and causing a temporary closure of the major international waterway. After a one-hour closure, traffic was diverted to the canal's western channel allowing all scheduled ships to go through, authorities said. AFP PHTO/STR (Photo credit should read STR/AFP via Getty Images)

Ismailia, EGYPT:  An undated file photo shows the Egyptian dredger Khattab that sank in the Suez Canal before dawn 13 September 2006, leaving two crewmembers dead and two others missing, and causing a temporary closure of the major international waterway. After a one-hour closure, traffic was diverted to the canal's western channel allowing all scheduled ships to go through, authorities said. AFP PHTO/STR  (Photo credit should read STR/AFP via Getty Images)

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SUEZ CANAL, RED SEA, EGYPT - JANVIER 20: Cargo ships queuing to pass the Suez Canal on Janvier 20, 2017 in Suez Canal, Red sea, Egypt. (Photo by Camille Delbos/Art In All of Us/Corbis via Getty Images)

SUEZ CANAL, RED SEA, EGYPT - JANVIER 20: Cargo ships queuing to pass the Suez Canal on Janvier 20, 2017 in Suez Canal, Red sea, Egypt. (Photo by Camille Delbos/Art In All of Us/Corbis via Getty Images)

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SUEZ CANAL, RED SEA, EGYPT - JANVIER 20: Loaded containers stacked on top of a cargo ship sailing in a canal on Janvier 20, 2017 in Suez Canal, Red sea, Egypt. (Photo by Camille Delbos/Art In All of Us/Corbis via Getty Images)

SUEZ CANAL, RED SEA, EGYPT - JANVIER 20: Loaded containers stacked on top of a cargo ship sailing in a canal on Janvier 20, 2017 in Suez Canal, Red sea, Egypt. (Photo by Camille Delbos/Art In All of Us/Corbis via Getty Images)