Chandler said the U.S. Army Corps of Engineers had adjusted a nearby dam to drop the river's water level by 2 feet and was regulating the current to make it easier on the divers, whom Chandler directs.

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The Xperia acro S has the highest level of water resistance of any smartphone, so you can drop it in your drink, then shake it off and carry on.

ENGADGET: Sony's Xperia acro S now on sale in unlocked form for $600 (updated: new pricing)

Nadel points to Ohalo, a site he excavated near the Sea of Galilee that had been submerged for 20, 000 years before a drop in water level made it easy to excavate.

CNN: Mysterious structure found at bottom of ancient lake

Nadel points to Ohalo II, a site he excavated near the Sea of Galilee that had been submerged for 23, 000 years before a drop in water level made it easy to excavate.

CNN: Mysterious structure found at bottom of ancient lake