Lake Mead is one of the most popular recreational destinations in the American West. But unbeknownst to many, a sunken B-29 rests on the bottom of the lake. Soon after WWII, a B-29 crashed and sank in the lake and was lost for over half a century. The Boeing B-29 Superfortress was the largest military project of World War II (costing even more than the Manhattan Project). It was a four-engine heavy bomber built for high-altitude strategic bombing to replace the older B-17 Flying Fortress.