USA Today: A 70-foot wave is a terrifying wall of water that only the best surfers can ride. But it's a midget compared with the colossal and mysterious waves that lurk under the ocean's surface.
These underwater waves, though seldom noticed, can rival skyscrapers in height and measure more than 100 miles wide. They can imperil submarines and disrupt operations on offshore oil platforms. They've been photographed by astronauts in orbit, and they've been cursed by bewildered sailors. Scientists are gaining...