Arctic Ocean acidifying up to four times faster than any other sea on Earth

FILE - The midnight sun shines over the ice-covered waters near Resolute Bay at 1:30 a.m. as seen from the Canadian Coast Guard icebreaker Louis S. St-Laurent Saturday, July 12, 2008. (THE CANADIAN PRESS / Jonathan Hayward) FILE - The midnight sun shines over the ice-covered waters near Resolute Bay at 1:30 a.m. as seen from the Canadian Coast Guard icebreaker Louis S. St-Laurent Saturday, July 12, 2008. (THE CANADIAN PRESS / Jonathan Hayward)

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Exploring a tunnel deep below Niagara Falls

Turbines that once harnessed the powerful energy of Niagara Falls into a great source of electricity came to a halt years ago. But the secrets deep below the power station are coming to life once again. Visitors can now explore the former cathedral of power and a new tunnel that opens to a spectacular view of the falls.

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