A new National Geographic Channel Documentary, Drain the Ocean, which airs tonight at 9Pm ET/PT, shows how, although the seas off the Bahamas can seem like a swimming pool, if you strip away the ocean and the edges of the islands’ shallow Great Bahama Bank–where the light blue begins to turn dark in satellite images of the Caribbean—it reveals steep cliffs rising some 2 miles (3.2 kilometers) above a vast plain (top photo).
By comparison, Yosemite National Park’s nearly 5,000-foot-tall (1,520-meter) Half Dome (bottom photo) is a molehill.
For much of the seafloor, accurate computer images like the one of the Grand Bahamas above are only now becoming possible. Unmanned subs, mapping software, and other technology are finally improving to the point where we can map the oceans to the same level of detail as Mars, some 35 million miles away,.
Photo: Burning Gold Productions via National Geographic Chanel
See the brief article at http://news.nationalgeographic.com/news/2009/08/photogalleries/drain-the-ocean-pictures/