"Drought May Reveal Mystery Plane" Topic

The drought that has parched much of the southwest may soon yield a mystery that has rested at the bottom of Nevada's Lake Mead for nearly 70 years, a B-29 bomber that went down carrying a top-secret missile defense system that may have actually caused the crash.

The B-29 bomber, also known as the "Superfortress" and the same model as the storied Enola Gay and Bockscar, the planes that dropped atomic bombs on Japan, crashed in 1948 as it flew over the giant lake testing a sun-powered missile guidance system. For decades, it lay at a depth of 300 feet in the man-made lake that was formed by construction of the Hoover Dam. But the drought has lowered water levels to the point where the plane is just 110 feet down, well within the range of recreational divers…

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This was featured in Fallout:New Vegas as a quest to refloat the bomber.

Professional divers can go to 300 feet easily. Wonder why no one has bothered to go down before now.

From Link
Better-equipped divers, using a special helium-rich gas mixture, for example, have been secretly exploring the crash site since 2001, when it was first discovered in the giant lake's Overton Arm section. But scuba divers have been officially banned by the National Park Service from exploring the site because of the dangers associated with such depths. With Lake Mead at record low levels, the federal agency intends to grant permits for diving the bomber, beginning in April.