A great armada entered the North Atlantic, launched from the cold shores of North America. But rather than ships off to war, this force was a fleet of icebergs, and the havoc it wrought was on the ocean current itself. A great armada entered the North Atlantic, launched from the cold shores of North America. But rather than ships off to war, this force was a fleet of icebergs, and the havoc it wrought was on the ocean current itself. Earth Sciences Environment Phys.org – latest science and technology news stories