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Zeppelin in flight
The De Beers Zeppelin-NT in flight near Table Mountain in Cape Town, South Africa. The airship typically takes off at sunset and flies for six or seven hours a night, when there is less turbulence. It can cover as many as 300 kilometers (about 186 miles) in a day, compared with 5 kilometers (just over 3 miles) for a ground crew, according to a survey team member.