Once we are in our kayaks, our guide, Timothy Duffy, leads us into a 10-mile-deep ice field dotted with blue-white bergs that vary in size from refrigerator to SUV to two-story house.

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Nerys Sanders, coastguard watch assistant at Swansea Coastguards, said staff at the base near Mumbles lighthouse first saw about 60 or 70 of the dark blue-grey whales about half a mile from the shore.

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Any asteroid as large as a half-mile across would cause a global catastrophe, if it struck the blue planet, he added.

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Any asteroid as large as a half-mile across would cause a global catastrophe, if it struck the blue planet, Chodas said.

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