A scientist does a check on an under-water biologically-driven system, marked by a white bouy so they can be easily identified in the water. During the August trial, titled Emerald Raptor, researchers used six hybrid fuel cells and four zero power ballasts in the demonstrations conducted in the bay between Shell Island and the Tyndall peninsula. (U.S. Air Force photo by Staff Sgt. Kirsten Wicker)

PHOTO BY: Staff Sgt. Kirsten Wicker
VIRIN: 110920-F-BS330-003.JPG
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