Hoover Dam is the heart of the American West’s water supply, a powerhouse for irrigation and farming in the region. But today a combination of drought and overuse have drained it half dry, leaving a 135-foot high “bathtub ring” mark around Lake Mead. Will America's largest reservoir ever fill up again as the water wars between cities, farmers and nature play out?

In July 2010, Alexandra Cousteau and her international Expedition Blue Planet team departed on a 14,500-mile journey across North America to investigate global water issues "in the backyard" of one of the world’s leading economies. Living, working and exploring water stories together, Alexandra and her team will use everything from the underwater gear invented by her grandfather to the latest in satellite technology and live social media to bring the thrill of adventure and the wonders of nature to audiences across the globe.

You can learn about the expedition at Blue Planet website.