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January 14, 2013 6:39 AM

Was one ship enough to tow Shell oil drilling rig in Gulf of Alaska?

When Royal Dutch Shell's oil drilling rig Kulluk and tow ship, the Aiviq, pulled out of Dutch Harbor the afternoon of Dec. 21 for a long, slow trip to Seattle, Shell says it was relying on its consultant's weather forecast to ensure crews -- and prized vessels -- arrived safely.

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