Caves In Great Lakes No Longer Safe To Visit - Picture Highlights Here

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With no letup in the cold, the ice hasn’t experienced the usual thaw-and-freeze cycle, so nature’s artistry is even more delicate and beautiful, with needle-like hoarfrost crystals sprinkled across sheets that dangle from cave ceilings like giant chandeliers. Photograph: Brian Peterson/AP


Coast guard cutters work to keep the St Marys river clear between Lakes Superior and Huron. They’ve logged four times more hours this season than the average for the same period in recent years. One day last month, the Mackinaw spent 16 grueling hours helping a freighter squeeze through a narrow 3.5-mile section of the river.


The Mackinac Bridge over the the Straits of Mackinac spans an ice cover that stretches into the horizon in Michigan. ‘That arctic vortex came down, and the ice just kept going,’ said George Leshkevich, a physical scientist with the federal lab.

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